Examples of antihistamines include diphenhydramine hydrochloride chlorpheniramine, and clemastine fumarate. Side effects include dizziness, nervousness, sleeplessness, and heart palpitations. Do NOT take with caffeine, other stimulants, or alcohol. Make sure you are taking the correct medication or else you may be doing yourself more harm than good. It is best not to suppress a productive cough as it helps the body clear its airways.
Side effects are rare if taken as directed.
Do not take if you have a chronic cough, asthma, emphysema, or excessive phlegm. This does not mean, however, that you should take a suppressant for a mucus producing cough all day. This will inhibit your body from coughing and clearing out mucus. Side effects are rare if taken as directed. Do not take if you have a chronic cough, asthma, emphysema, or excessive phlegm.