Even nonprescription drugs can be photosensitizers. Paradoxically, one commonly used drug can decrease sun sensitivity . Aspirin is widely deposited in the skin and acts like a sunscreen to absorb the damaging UV rays of the sun before they can injure the skin. However, the effect is modest . Experts recommend using a sunscreen with a SPF of at least 15, and preferably 30.
Vitamin C can also have a modest protective effect.
Whenever you start taking a new drug or using a new skin lotion or aftershave, use plenty of sunscreen and apply it frequently. Carefully monitor your time in the sun for early signs of sunburn, then seek shade. A cautious approach should give you many healthy years of fun in the sunny outdoors. The following is a partial list of drugs and chemicals that are photosensitizers. Whether taken internally or rubbed on the skin, they can cause an exaggerated sunburn in susceptible people.