Which medication can cause photosensitivity as a side effect?

Doxycycline is an antibiotic that belongs to the tetracycline class of medications, and one of its known side effects is photosensitivity. This means that individuals taking doxycycline may be more susceptible to sunburn and skin rashes when exposed to sunlight or UV rays. It’s important for patients on doxycycline to take precautions like wearing sunscreen or protective clothing when outdoors.

In contrast, amoxicillin is a penicillin-type antibiotic that typically does not have photosensitivity as a known side effect. Metformin, an oral medication used to manage type 2 diabetes, generally does not cause photosensitivity either. Lisinopril, an ACE inhibitor used for hypertension and heart failure, also does not have a correlation with increased sensitivity to sunlight. Thus, doxycycline stands out as the correct answer due to its established association with photosensitivity reactions.