Popular examples of OTC drugs include pain relievers such as acetaminophen (Tylenol) and ibuprofen (Motrin, Advil), cough suppressants like dextromethorphan (Robitussin) and antihistamines such as loratadine (Claritin 24H). 

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Certain OTC medicines alleviate aches, pains, and itchiness, while some prevent or cure diseases, such as tooth decay or an athlete's foot. Others help manage recurrent problems, such as migraines and allergies.

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Yes, acetaminophen (paracetamol) is an OTC painkiller available from pharmacies to treat acute pain. 

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A key distinction between vitamins, supplements, and herbals is that they do not undergo the same testing as OTCs. Although they come in similar packages and may be molded just like pills, they are not regarded as OTC medicines.

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The primary component of NyQuil is Doxylamine Succinate, which is an antihistamine that causes drowsiness by obstructing histamine from binding to the brain receptors.

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Technically, NyQuil can be taken during the day, but it can cause the user to feel tired and drowsy. Hence, it's best to take it at night, or if you have planned to stay home for the rest of the day.

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NyQuil and alcohol should never be combined. Doing so can bring about unpleasant short-term side effects and, in some cases, lead to more serious long-term effects. 

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If you just consumed a drink, you should not take NyQuil for at least an hour. On the other hand, since NyQuil lasts about 4 to 6 hours per dose, you should wait for that period to pass before having a drink.

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Although the average dose of Nyquil lasts for around 4 to 6 hours, doxylamine may have a significantly larger range of effects. Depending on the person, its effects can last anywhere between 3 to 8 hours. 

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A standard dose of Nyquil wouldn't do anything other than make you sleepy. However, DXM is a dissociative drug at higher doses and will definitely keep you awake and high. 

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