Many people have no problems, and others react only mildly. It is known that photosensitivity is hard to predict, and just because someone else hasn't had a reaction doesn't mean it won't happen with you. It is also known that the same person can also respond in different ways at different times. Many factors enter into this. Here you must be warned-don't be fooled if you haven't reacted while taking one of these drugs in the past .
Photosensitivity can still occur the next time around.
It must be also noted that in some cases, photosensitivity may also continue after a drug is stopped. With tetracycline for example, some people stay sensitive for several weeks. Because photosensitivity is so hard to predict, the best approach is to prevent reactions by always protecting your skin. Using long-sleeved clothing and a head covering are advisable as well. Be wary of the sun, but also remember some types of lights also can be harmful as well as reflected light such as snow glare.