If you have a known health condition or are taking other medications, check with your doctor before choosing a cold medicine from your local pharmacy or supermarket. If the medicine does not say it’s an antihistamine, look for these ingredients to know for sure: diphenhydramine, chlorpheniramine maleate and doxylamine succinate are all antihistamines. Antihistamines are known to cause drowsiness in some people. Some cold medicines, especially those labeled for both allergies and colds, may have an antihistamine in them to help with a runny nose and postnasal drip. These typically do not cause drowsiness and can make some people feel hyper or more alert. Examples include phenylephrine and pseudoephedrine. Since the main symptom of a cold is congestion in your nose and/or chest, cold medicines usually contain a decongestant ingredient.
None of these ingredients has sleep-inducing properties. They all can relieve pain associated with cold and flu, like headaches and body aches, and they can help reduce a fever as well. Most cold and flu medicines sold in stores contain aspirin, acetaminophen or ibuprofen. You should also know that, usually, medicines labeled “nighttime” are formulated to help you sleep. This can help avoid unwanted side effects such as drowsiness. It’s important to choose cold medicine with only the ingredients you need. Not all labels say “drowsy” or “non-drowsy,” so we want to give you some more information that can help you find a non-drowsy cold medicine. First, let’s look at ingredients typically found in cold medicines. The second reason is that an ingredient in the cold medicine could be interacting with another medicine you take, which could cause drowsiness. One is that one or more ingredients in the medicine may cause drowsiness. There are two main reasons cold medicines might make you drowsy.
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