In most cases, changes in the menstrual cycle are normal, as menstruation can begin earlier or later between cycles. However, if the menstrual cycle frequently changes, it may be due to several causes, including medication use. So, does taking allergy medication affect menstruation?

Chlorpheniramine 4mg is a medication commonly prescribed to treat allergy symptoms such as hives, angioedema, and rhinitis. So, what is Chlorpheniramine 4mg and what is the correct dosage?