Nyquil, the "nighttime, sniffling, sneezing, so-you-can-rest" medicine, is a well-known over-the-counter medicine used to treat general cold or flu symptoms. It is available as a liquid or in capsule form and is manufactured by Vicks. Nyquil contains acetaminophen, dextromethorphan and doxylamine. Acetaminophen is an analgesic (pain reliever) that also reduces fever. Dextromethorphan is a cough suppressant and doxylamine succinate, an antihistamine, reduces allergy reactions and typically induces drowsiness.
Common Side Effects
Common side effects that have been associated with taking Nyquil include diarrhea, constipation, headaches and stomach irritation. Other complaints following the use of Nyquil are dizziness, drowsiness, nausea or vomiting. Anxiety, nervousness or excitability, and sleeping problems also have been reported.
Severe Effects
The multi-drug combination in Nyquil increases the variability of possible reactions. Severe allergic reactions may include: rash or hives, breathing problems, seizures, or an irregular heartbeat with a feeling of chest tightness. Other signs that may occur are swelling about the face, mouth or tongue, marked difficulty in urinating, and jaundice. If any of these signs present, immediate medical attention is needed.
Precautions
Alcohol is one of Nyquil's inactive ingredients, so it should not be taken with alcohol or by individuals who have difficulty in controlling their alcohol intake. Also, individuals with chronic pulmonary conditions (asthma, emphysema, etc.) or glaucoma should check with their physician first before taking this Vicks product. Lastly, there is what is known as the "sore throat warning" that should be acted upon if necessary. Basically, if one experiences a persistent, major sore throat with a fever or rash, nausea or vomiting for over two days, then a physician should be seen immediately.
