Some common side effects of clorfeniramina include drowsiness, dizziness, dry mouth, and nausea. These side effects usually go away after a few days of use. However, clorfeniramina can also cause more serious side effects, such as confusion, hallucinations, and seizures. These side effects are more likely to occur in older adults and people with certain medical conditions, such as liver or kidney disease.
Clorfeniramina should not be taken with alcohol or with other medications that cause drowsiness. It is also not recommended for use in children under 2 years of age.
If you are experiencing symptoms of allergies, talk to your doctor about whether clorfeniramina is right for you.