Cephalexin and Photosensitivity

Antibiotics Known to Cause Photosensitivity

Tetracyclines, especially doxycycline, are well-documented to cause photosensitivity, manifesting as an exaggerated sunburn reaction 1, 2
The Centers for Disease Control and Prevention recommends that patients taking tetracyclines, such as doxycycline, avoid prolonged direct exposure to the sun, use sunscreens that absorb long-wave ultraviolet (UVA) radiation, and take the medication in the evening to minimize sun exposure risk 2

The American Academy of Dermatology suggests that when prescribing antibiotics with known photosensitivity risks, such as doxycycline, patients should be advised to avoid prolonged direct exposure to the sun, use sunscreens that absorb long-wave ultraviolet (UVA) radiation, and take the medication in the evening to minimize sun exposure risk 2
For patients with a history of photosensitivity reactions, cephalexin would be preferred over tetracyclines or fluoroquinolones when clinically appropriate, as recommended by the Centers for Disease Control and Prevention 2

The Journal of the American Academy of Dermatology recommends considering cephalexin as an alternative to tetracyclines for patients concerned about photosensitivity, especially when treating acne in patients with outdoor activities 4