Benadryl or nyquil for sleep

Alternatives. Benadryl (diphenhydramine) and Unisom (doxylamine succinate) are sleep aids that can be purchased over the counter. Both medications are antihistamines that have sedative side effects. Generic versions are also available. These medications are meant to treat short-term sleep problems.

Benadryl or nyquil for sleep. ZzzQuil is better for sleep and NyQuil is a cough, cold and flu medicine. Since they are made for these purposes, you should only use them as such. Only take NyQuil if you’re sick since it has active ingredients that are used to relieve certain symptoms. If you’re looking for a sleep aid, then ZzzQuil is your better option.

A doctor has provided 1 answer. took 150 mg benadryl. 20 mg melatonin and nyquil. i cant keep my eyes open but also cant sleep. its been 6 hrs. can i take more benadryl? i need sleep: Will not likely work: There is something else causing your insomnia an.

Active ingredient (in each 30 mL dose cup) Diphenhydramine HCl 50 mg. Purpose. Nighttime sleep-aid. Uses. for the relief of occasional sleeplessness - reduces time to fall asleep if you have difficulty falling asleep. Warnings. Do not use - for children under 12 years of age - with any other product containing diphenhydramine, even one used on ... Benadryl has an average rating of 7.3 out of 10 from a total of 78 ratings on Drugs.com. 65% of reviewers reported a positive effect, while 18% reported a negative effect. Vicks Nyquil D Cold and Flu Nighttime Relief has an average rating of 8.2 out of 10 from a total of 5 ratings on Drugs.com. 60% of reviewers reported a positive effect, while ... But a 2015 Consumer Reports national survey of 4,023 adults found a troubling trend: Of the 20 percent who took an OTC medication within the past year to improve sleep, almost 1 in 5 respondents ...Effectiveness. Why it’s not recommended. Side effects. Other sleep aids. When to talk with a pro. Takeaway. Many antihistamines can cause drowsiness, but it’s not recommended to take them for...0 Adults should never use Benadryl or other antihistamines to get infants to go to sleep or to be quiet. * Only use antihistamines like Benadryl when prescribed ...Apr 24, 2023 · Effectiveness. Why it’s not recommended. Side effects. Other sleep aids. When to talk with a pro. Takeaway. Many antihistamines can cause drowsiness, but it’s not recommended to take them for... Diphenhydramine (Benadryl, Advil PM, others). Doxylamine (NyQuil Cold & Flu, Nighttime Cold & Flu Relief, others). Chlorpheniramine (Chlor-Trimeton, Alka-Seltzer Plus Cold Medicine, others). Antihistamines that make you sleepy can be useful as a sleep aid once in a while. See more

Feb 20, 2023 · Zzzquil and Nyquil are over-the-counter medications that can be used as sleep aids. ZzzQuil is labeled as a nighttime sleep aid and only contains one ingredient, diphenhydramine. NyQuill contains doxylamine, an antihistamine, acetaminophen, and dextromethorphan, to treat cough and cold symptoms. Therefore, it takes about 52 to 65 hours to get all the ingredients from this NyQuil product out of your system. Elimination of drugs from your body can vary, based on your kidney or liver function, age, weight, hydration or other factors. Acetaminophen has a half-life of about 1.25 to 3 hours, doxylamine is 10 hours, and alcohol is 4 to 5 hours.Getting a good night’s sleep is essential for our overall health and well-being. But if you’re not sleeping on the right bedding, you may be missing out on the best sleep of your l...However, one of these drugs, Benadryl (diphenhydramine), is commonly used in over-the-counter sleep agents. Taking an over-the-counter sleep aid with diphenhydramine once in a while is generally not going to cause problems, other than a possible hangover the next day. Older people, however, can get confused when taking …Diphenhydramine is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. These symptoms include rash, itching, watery eyes, itchy eyes /nose/throat, cough, runny ...Some Z drugs can help with both getting to sleep and sleeping through the night, but others are only recommended by the American Academy of Sleep Medicine …Getting a good night’s sleep is essential for our overall health and well-being. But if you’re not sleeping on the right bedding, you may be missing out on the best sleep of your l...

What is Mucinex Fast-Max Night Time Cold and Flu? Acetaminophen is a pain reliever and fever reducer. Diphenhydramine is an antihistamine. Phenylephrine is a decongestant.. Mucinex Fast-Max Night Time Cold and Flu is a combination medicine used to treat cold and flu symptoms such as runny or stuffy nose, sneezing, cough, sore …Find out more in my in-depth Natrol review. 2. Vitafusion SleepWell. 3mg melatonin combined with herbal ingredients. I’ve noticed a growing trend of over the counter sleep aids that combine melatonin and herbal ingredients, which are sometimes included to boost the sleep-promoting effect.Since both ZzzQuil and Benadryl have diphenhydramine as their active ingredient, they are very similar in terms of their effectivity, safety, and side effects. They are also both readily available even without prescription. The only difference between these two is that ZzzQuil is marketed as a sleep aid. As such, Benadryl is the more economic ...When diphenhydramine is used to treat insomnia it is taken at bedtime (30 minutes before planned sleep). When diphenhydramine is used to treat abnormal movements, it is usually taken three times a day at first and then taken 4 times a day. Follow the directions on the package or on your prescription label carefully, and ask your doctor or ...sunlight in the morning. exercise in the morning, especially hard exercise like cardio or weights. in the evenings, dim all the lights. close your eyes, and even sit in a pitch-black room or put something over your eyes, and take slow, deep breaths. Honestly this this the best trick, I don’t know why it works so well, but it does.Since I know sleep is a problem for you, let's discuss that for a moment. There are two reasons NyQuil makes you tired: Doxylamine, the antihistamine contained in it, is sedating. It is a first-generation antihistamine similar to Benadryl (diphenhydramine). It contains 10% alcohol by volume (there are alcohol-free versions of NyQuil available).

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The CDC outlines recommended hours of sleep for babies, children, teens, and adults. Trusted Health Information from the National Institutes of Health Eight hours of sleep a day ke...NyQuil Contains More Ingredients. In addition to the difference in antihistamines, Nyquil contains additional ingredients for the treatment of cough/cold symptoms. ZzzQuil contains diphenhydramine as the only ingredient. It is intended solely for use as a nighttime sleep aid. NyQuil on the other hand contains additional ingredients:Lucky; October 3, 2018; For Insomnia "Diphenhydramine is a fantastic sleep aid, but you need to follow the dosage very, very, carefully. I've struggled with insomnia since basically puberty, and few years back I began taking zzzquil daily. I slowly grew a tolerant to it, and increased my dosage eventually to 100mg.Jun 24, 2022 ... These include medications like Aleve PM, Nyquil, Tylenol PM, Unisom, and Benadryl. Hydroxyzine is a prescription-only antihistamine that is ...Prescribed for Cold Symptoms. DayQuil/NyQuil Severe Cold and Flu may also be used for purposes not listed in this medication guide. Prescription and OTC. Diphenhydramine is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a ...Benadryl vs Nyquil – detailed comparison: Benadryl. It is the brand name of a medication called diphenhydramine, a first-generation antihistamine that is used to relieve symptoms of the common cold, allergy, and hay fever. Uses. This medication is used to treat a variety of conditions, like – allergic symptoms, itchiness, insomnia (sleep ...

Many medications can make sleep apnea worse, including: Barbiturates. Benzodiazepines. Some beta-blockers. Opioids. Sildenafil (an erectile dysfunction drug) Testosterone. Drugs that cause you to ...Nov 21, 2023 · Alternatives. Benadryl (diphenhydramine) and Unisom (doxylamine succinate) are sleep aids that can be purchased over the counter. Both medications are antihistamines that have sedative side effects. Generic versions are also available. These medications are meant to treat short-term sleep problems. There are several important points to consider before using NyQuil to help get to sleep. We discuss whether NyQuil can be used as a sleep aid and why it should not be used long-term. We also explore other ways to improve sleep and when to talk to a doctor.Eating at night may be common for some, but regularly binge eating while sleeping with little to no memory of it may signal sleep-related eating disorder (SRED). If you regularly b...Doxylamine succinate (Unisom SleepTabs) is an over-the-counter antihistamine that can be taken by adults and children ages 12 years and older who are having trouble falling asleep. It's a sleep aid that works by blocking certain chemicals (histamine) in your body. Doxylamine (Unisom SleepTabs) is taken by mouth once a …Diphenhydramine is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a common side... View more. Prescription and OTC. Prescribed for Insomnia. Unisom SleepGels may also be used for purposes not listed in this medication guide.When it comes to getting a good night’s sleep, the mattress you choose can make all the difference. With so many mattress options available, it can be overwhelming to decide which ...Risk of side effects. When it comes to taking Benadryl for sleep or allergies, there's also potential for some not-so-great side effects, says Dr. Katznelson; these can include mouth dryness, constipation, retaining urine, cognitive dysfunction (i.e. trouble thinking), and risk of seizure if you take too high of a dose.The short answer is yes, you can. However, there are a few things to keep in mind before taking the plunge. Nyquilcontains acetaminophen, an active ingredient that can help to reduce fever and pain. It also contains diphenhydramine, an antihistamine that can cause drowsiness. For these reasons, it's generally safe to take a sleep aid with Nyquil.Lucky; October 3, 2018; For Insomnia "Diphenhydramine is a fantastic sleep aid, but you need to follow the dosage very, very, carefully. I've struggled with insomnia since basically puberty, and few years back I began taking zzzquil daily. I slowly grew a tolerant to it, and increased my dosage eventually to 100mg.Warnings. One ingredient in this product is acetaminophen. Taking too much acetaminophen may cause serious (possibly fatal) liver disease. Adults should not take more than 4000 milligrams (4 grams ...

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Getting a good sleep is vital to your health, but many Americans don't get enough. Learn about sleep disorders, treatments, and good sleep habits. Sleep is a complex biological pro...Oct 1, 2020 ... FDA warns about serious problems with high doses of the allergy medicine diphenhydramine (Benadryl). Teen misuse sparked by dangerous “Benadryl ...Not being a smart ass but think you’d get the most accurate information from them. 100 mg of Benadryl sounds like a LOT to me but I realize that we are all different. Good luck! Ambien. Need to go to sleep early tonight but my sleep schedule won’t allow that. I’m debating between buying NyQuil at my local Walgreens or taking 100mg of….More about Vicks Nyquil D Cold and Flu Nighttime Relief ( acetaminophen / dextromethorphan / doxylamine / pseudoephedrine ) Ratings & Reviews. Diphenhydramine has an average rating of 5.5 out of 10 from a total of 531 ratings on Drugs.com. 44% of reviewers reported a positive effect, while 41% reported a negative effect.Acetaminophen is for pain management, dextromethorphan is for cough suppression, and doxylamine is an antihistamine used for sleep, runny nose, sneezing, itching, and watery eyes. Doxylamine is the ingredient in NyQuil that causes sedation as it is a first-generation antihistamine (similar to Benadryl).Update: Some offers mentioned below are no longer available. View the current offers here. Amtrak is running a new BOGO promotion on sleeper cars, where you'... Update: Some offers...Can i take benadryl (diphenhydramine) and nyquil together? A doctor has provided 1 answer. Dr. Paul Grin answered. Specializes in Pain Management. You can, but: Not recommended due to drug interactions. Both drugs increase sedation and drowsiness. Dr Kent agreed. Answered 5/3/2021. 4.5k views.oh my god of course! i’m happy to help, i really hope you can get something. if you can’t, i also recommend the Pacifica dream sleep gummies. melatonin always left me feeling like a zombie (so make sure you’re careful how many milligrams you take a night, i wouldn’t just do a straight up 10 mil of melatonin cause that could have you sleeping for a day or two …NyQuil also contains one of the following antihistamines to help with a runny nose and sleep: Chlorpheniramine. Diphenhydramine. Doxylamine. If you’re taking liquid NyQuil, make sure to use the dosing cup provided when taking the medication. Using household spoons to measure out doses can lead to doses that are too high or too low.

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The active ingredients in NyQuil are acetaminophen, dextromethorphan HBr and doxylamine succinate. NyQuil also contains a number of inactive ingredients.Stop use and ask a healthcare provider if: Pain or cough worsens or lasts more than seven days. Fever worsens or lasts more than three days. Redness or swelling is present in area causing pain. New symptoms occur. Cough returns or occurs with a rash or headache that won't go away.Risk of side effects. When it comes to taking Benadryl for sleep or allergies, there's also potential for some not-so-great side effects, says Dr. Katznelson; these can include mouth dryness, constipation, retaining urine, cognitive dysfunction (i.e. trouble thinking), and risk of seizure if you take too high of a dose.Jul 22, 2019 · And your quality of sleep using it ( or even something like Benadryl) may not even be that great. “There is wide variation in the sleepiness effect of Nyquil,” Watson said. “This is likely related to genetic factors that influence how much of the drug is absorbed and how effective it is blocking histamine functionality in the brain.” Getting a good sleep is vital to your health, but many Americans don't get enough. Learn about sleep disorders, treatments, and good sleep habits. Sleep is a complex biological pro...Diphenhydramine is also the main ingredient in Benadryl. In this case, though, the sleepiness effect is considered a downside of using the drug to tame allergy symptoms. More than half of all over-the-counter sleep aids contain medications that block H1 receptors, such as diphenhydramine or doxylamine (found in Nyquil and Unisom).It’s the active ingredient in Benadryl, an antihistamine meant to treat symptoms of an allergic reaction like itchiness, watery eyes, and sneezing. The sleepy part is really just a side effect...So it's one thing to take a dose of NyQuil when you're sick and having a hard time sleeping — but taking an antihistamine-containing OTC sleep aid just to sleep better is unlikely to produce the desired result, says Dr. Stahl. Other side effects of antihistamine-containing OTC sleep aids can include dry mouth, constipation, blurry vision, and ...When purchasing doxylamine or diphenhydramine as OTC sleep aids, you’ll notice there’s a difference in dosing. The usual dose of doxylamine is 25 mg, taken 30 minutes before bedtime. The typical dose for diphenhydramine for sleep is 50 mg, taken 30 minutes before bedtime. These doses should provide similar effects. ….

If you find yourself constantly tossing and turning all night, maybe it’s time to toss out your old mattress. For a better night’s sleep, look for a mattress that reduces pressure ...Taking NyQuil can make people drowsy and fall asleep, which is the major side effect of the drug. The duration and quality of sleep can vary depending on the person. Other, rarer, side effects are mainly due to the acetaminophen component and can include: Skin reddening. Blisters.redrabbit12. •. Benadryl and other antihistamines of the short should be used sparingly as sleep aids. Particularly because they are anti cholinogeric (sp) thus can (and do) produce hallucinations at high enough doses, though they are typically negatively geared, with an emphasis on delirium and psychosis.More about Vicks Nyquil D Cold and Flu Nighttime Relief ( acetaminophen / dextromethorphan / doxylamine / pseudoephedrine ) Ratings & Reviews. Diphenhydramine has an average rating of 5.5 out of 10 from a total of 531 ratings on Drugs.com. 44% of reviewers reported a positive effect, while 41% reported a negative effect.Feb 21, 2023 ... Diphenhydramine (Benadryl, Sominex, Tylenol PM, Unisom SleepGels) · Doxylamine (Unisom Sleep Tabs, NyQuil) · The problem with antihistamines as ...Manuel Breva Colmeiro via Getty Images. Taking Benadryl to help you get to sleep is okay in small doses once in a while ― but, again, it doesn’t lead to better quality sleep, Elliott said. Because antihistamines can peer pressure your body to spend more time in the lighter stages of sleep, the eight hours you clock in bed might end up ...Aug 2, 2023 · nausea, pain in your upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). Common side effects of Nyquil Cold and Flu may include: headache, sleep problems (insomnia); upset stomach, diarrhea or constipation; dry eyes, blurred vision, dry mouth or nose; However, one of these drugs, Benadryl (diphenhydramine), is commonly used in over-the-counter sleep agents. Taking an over-the-counter sleep aid with diphenhydramine once in a while is generally not going to cause problems, other than a possible hangover the next day. Older people, however, can get confused when taking … FALL ASLEEP FAST. ZzzQuil helps you fall asleep and wake refreshed. World's #1 selling sleep aid brand†. From the trusted Sleep Experts at Vicks. NON-HABIT FORMING. ZzzQuil contains a non-habit-forming ingredient, Diphenhydramine HCI, that helps you get the sleep you need. Benadryl or nyquil for sleep, Taking Benadryl to help you get to sleep is okay in small doses once in a while ― but, again, it doesn’t lead to better quality sleep, Elliott said. Because …, NIGHTTIME SLEEP-AID. Diphenhydramine HCl. Fall Asleep Fast. Non-Habit Forming. Warming Berry. Not for colds or for pain. Alcohol 10% 12 FL OZ (354 ml) ZZZQUIL NIGHTTIME SLEEP-AID diphenhydramine hydrochloride liquid: Product Information: Product Type: HUMAN OTC DRUG: Item Code (Source) NDC:37000-500:, More about ZzzQuil ( diphenhydramine ) Ratings & Reviews. Benadryl has an average rating of 7.3 out of 10 from a total of 78 ratings on Drugs.com. 65% of reviewers reported a positive effect, while 18% reported a negative effect. ZzzQuil has an average rating of 2.7 out of 10 from a total of 67 ratings on Drugs.com. 16% of reviewers reported a ..., Jan 8, 2020 · Since I know sleep is a problem for you, let's discuss that for a moment. There are two reasons NyQuil makes you tired: Doxylamine, the antihistamine contained in it, is sedating. It is a first-generation antihistamine similar to Benadryl (diphenhydramine). It contains 10% alcohol by volume (there are alcohol-free versions of NyQuil available). , NyQuil is an over-the-counter medication used to treat nighttime symptoms of colds and the flu that might keep you awake. NyQuil contains acetaminophen, …, There are several important points to consider before using NyQuil to help get to sleep. We discuss whether NyQuil can be used as a sleep aid and why it should not be used long-term. We also explore other ways to improve sleep and when to talk to a doctor., There are no reported withdrawal symptoms for Benadryl if taken as directed. Benadryl is a brand name for the antihistamine diphenhydramine, which is not considered to be an addict..., How to Safely Start Treatment. Once your doctor chooses a sleep aid, you should read the pamphlet carefully, follow your doctor’s instructions on dosage and timing, and ask any relevant questions. Avoid starting treatment right before an important event, in case the medication causes unexpected side effects. Most sleep aids are designed to be ..., Zzzquil and Nyquil are over-the-counter medications that can be used as sleep aids. ZzzQuil is labeled as a nighttime sleep aid and only contains one ingredient, diphenhydramine. NyQuill contains doxylamine, an antihistamine, acetaminophen, and dextromethorphan, to treat cough and cold symptoms., Jan 31, 2024 · NyQuil can cause you to feel very drowsy or sleepy and you may fall asleep after taking it. Be careful when driving or operating machinery if you have taken this product. Avoid drinking alcoholic beverages with NyQuil. Alcohol, sedatives and tranquilizers can increase drowsiness when used with NyQuil. Check with your doctor or pharmacist first ... , Diphenhydramine is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a common side... View more. Prescription and OTC. Prescribed for Insomnia. Unisom SleepGels may also be used for purposes not listed in this medication guide., Dec 20, 2022 ... Insomnia; Blurred vision; Shortness of breath; Fast, irregular, or weak pulse. Many of these side effects can interfere with people's ability to ..., Aug 12, 2018 · ZzzQuil is best used if you cannot sleep. The active ingredient is diphenhydramine, which is the same as in benadryl. Try to not use this too often. Best for: People who’re suffering from insomnia; People who want a sedating sleep aid; 4.3 . NyQuil. NyQuil is best used for if you’re sick (or starting to feel sick). , May 4, 2023 · There are several important points to consider before using NyQuil to help get to sleep. We discuss whether NyQuil can be used as a sleep aid and why it should not be used long-term. We also explore other ways to improve sleep and when to talk to a doctor. , Apr 24, 2023 · Effectiveness. Why it’s not recommended. Side effects. Other sleep aids. When to talk with a pro. Takeaway. Many antihistamines can cause drowsiness, but it’s not recommended to take them for... , You can find diphenhydramine and doxylamine in many over-the-counter sleep aids. Diphenhydramine is the snooze-inducing ingredient in drugs like: Benadryl®. Unisom®. Advil PM®. Doxylamine is ... , You can find diphenhydramine and doxylamine in many over-the-counter sleep aids. Diphenhydramine is the snooze-inducing ingredient in drugs like: Benadryl®. Unisom®. Advil PM®. Doxylamine is ... , Benadryl (generic name: diphenhydramine) is an antihistamine that causes sleepiness in most people. Some people use Benadryl to help with sleep or insomnia, but this should only be for short-term use. Do not use Benadryl to make a child sleepy. Contact your doctor if you or your child are having trouble with sleep. Continue …, Diphenhydramine (Benadryl, Advil PM, others). Doxylamine (NyQuil Cold & Flu, Nighttime Cold & Flu Relief, others). Chlorpheniramine (Chlor-Trimeton, Alka-Seltzer Plus Cold Medicine, others). Antihistamines that make you sleepy can be useful as a sleep aid once in a while. See more, Jan 8, 2020 · Since I know sleep is a problem for you, let's discuss that for a moment. There are two reasons NyQuil makes you tired: Doxylamine, the antihistamine contained in it, is sedating. It is a first-generation antihistamine similar to Benadryl (diphenhydramine). It contains 10% alcohol by volume (there are alcohol-free versions of NyQuil available). , If you’ve ever been up late at night and shunned sleep in favor of other activities, you may actually be creating an unhealthy habit of revenge bedtime procrastination. Read More. VIEW ALL ARTICLES. ZzzQuil helps adults and children safely fall asleep fast and wake up feeling refreshed Shop for sleep aid products and learn more about ..., ZzzQuil is an over-the-counter sleep remedy. The allergy medication Benadryl has an active ingredient called diphenhydramine, which is also found in ZzzQuil. ... Does NyQuil work as a sleep aid? Over-the-counter medicines that help with cold and flu are only effective for a short period of time. They aren’t asleep aid and shouldn’t be used ..., Active ingredient (in each 30 mL dose cup) Diphenhydramine HCl 50 mg. Purpose. Nighttime sleep-aid. Uses. for the relief of occasional sleeplessness - reduces time to fall asleep if you have difficulty falling asleep. Warnings. Do not use - for children under 12 years of age - with any other product containing diphenhydramine, even one used on ..., Aug 2, 2023 · nausea, pain in your upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). Common side effects of Nyquil Cold and Flu may include: headache, sleep problems (insomnia); upset stomach, diarrhea or constipation; dry eyes, blurred vision, dry mouth or nose; , Can Benadryl Help You Sleep? Benadryl makes people sleepy because it blocks a molecule in the body called histamine. Histamine helps the body fight off germs, but it also causes the unpleasant …, Alternatives. Benadryl (diphenhydramine) and Unisom (doxylamine succinate) are sleep aids that can be purchased over the counter. Both medications are antihistamines that have sedative side effects. Generic versions are also available. These medications are meant to treat short-term sleep problems., ZzzQuil is not some mystical sleep syrup, nor is it just the sleepy stuff from NyQuil. In fact, it’s just diphenhydramine, the antihistamine found in Benadryl and countless generic allergy ..., Benadryl (diphenhydramine) and Unisom (doxylamine succinate) are sleep aids that can be purchased over the counter. Both medications are antihistamines …, How to Safely Start Treatment. Once your doctor chooses a sleep aid, you should read the pamphlet carefully, follow your doctor’s instructions on dosage and timing, and ask any relevant questions. Avoid starting treatment right before an important event, in case the medication causes unexpected side effects. Most sleep aids are designed to be ..., Using Melatonin or Benadryl to Sleep? Read this. - The New York Times. The Trouble With Sleep Aids. Not all sleep medications are the same. Here’s how to find one that works for you...., May 4, 2023 · There are several important points to consider before using NyQuil to help get to sleep. We discuss whether NyQuil can be used as a sleep aid and why it should not be used long-term. We also explore other ways to improve sleep and when to talk to a doctor. , Prescribed for Cold Symptoms. DayQuil/NyQuil Severe Cold and Flu may also be used for purposes not listed in this medication guide. Prescription and OTC. Diphenhydramine is an antihistamine that can be used to treat allergic reactions, relieve motion sickness, as a sleep aid, and relieve some symptoms of Parkinson's disease. Sedation is a ..., nausea, pain in your upper stomach, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of your skin or eyes); or. dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, chest pain, shortness of breath, uneven heartbeats, seizure). Common side effects of NyQuil Severe Cold and …