Which antibiotic class commonly causes photosensitivity?

Which antibiotic class commonly causes photosensitivity?

• A. Aminoglycosides.
• B. Macrolides.
• C. Penicillins.
• D. Tetracyclines.

Answer: (D)

Photosensitivity from antibiotics is a sun-driven skin reaction where the drug absorbs light and damages skin cells. This is most classic with tetracyclines. When someone taking a tetracycline is exposed to sunlight or UVA light, the drug can absorb that energy and create reactive species in the skin, leading to a sunburn-like rash, itching, or increased sensitivity to sunlight. It’s often dose-dependent and more noticeable with outdoor sun exposure or tanning. Aminoglycosides aren’t typically associated with photosensitivity; their main concerns are kidney and ear toxicity. Penicillins can cause hypersensitivity reactions or rashes but not the characteristic light-induced skin reactions. Macrolides may cause GI upset or QT effects, but photosensitivity isn’t a typical hallmark. Therefore, the best answer is the tetracyclines, with practical takeaways being to use sun protection, wear protective clothing, and avoid excessive sun exposure while on these drugs.

Photosensitivity from antibiotics is a sun-driven skin reaction where the drug absorbs light and damages skin cells. This is most classic with tetracyclines. When someone taking a tetracycline is exposed to sunlight or UVA light, the drug can absorb that energy and create reactive species in the skin, leading to a sunburn-like rash, itching, or increased sensitivity to sunlight. It’s often dose-dependent and more noticeable with outdoor sun exposure or tanning.

Aminoglycosides aren’t typically associated with photosensitivity; their main concerns are kidney and ear toxicity. Penicillins can cause hypersensitivity reactions or rashes but not the characteristic light-induced skin reactions. Macrolides may cause GI upset or QT effects, but photosensitivity isn’t a typical hallmark. Therefore, the best answer is the tetracyclines, with practical takeaways being to use sun protection, wear protective clothing, and avoid excessive sun exposure while on these drugs.