What is a common side effect of Allegra?

A common side effect of Allegra, which is an antihistamine used to relieve allergy symptoms, is a headache. This medication works by blocking histamine receptors, helping to alleviate symptoms like sneezing and runny nose. However, one of the more frequently reported side effects among users is indeed headaches. This side effect can arise due to various factors, including the body's adjustment to the medication and the impact of alleviating allergy symptoms that may have contributed to discomfort prior to treatment.

The other options listed, such as hypertension, amnesia, and hypotension, are not typical side effects associated with Allegra. Hypertension may occur with other medications or conditions, amnesia is not linked to antihistamines generally, and hypotension is less common as a side effect of allergy medications like Allegra. Understanding the side effects of medications helps in monitoring patients and managing any adverse reactions effectively.