Porphyria Educational Services
PORPHYRIA EDUCATIONAL SERVICES Vol.1 No. 11 March 1999
Photosensitivity and Drug Labeling
by Diana Deats-O'Reilly
Special labels are often attached to the medicine containers of
those drugs that have photosensitive properties within them. My
pharmacy uses a different color little stickers that goes on the
side of the basic pharmaceutical information. These labels are
put on drugs that may cause an unusual response to the sun and
other sources of ultraviolet (UV) light.
This is called "photosensitivity,. There are several
reactions that can occur in dealing with photosensitivity.. The
most common reaction is an intense or exaggerated sunburn.
However rashes, blistering, swelling and other skin
problems can also occur. Skin can become very fragile.
It is important to note here that not everyone who takes these
drugs has a reaction. Many people have no problems, and others
react only mildly. It is known that photosensitivity is hard to
predict. ust 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.
The amount of medication you take, other
drugs or products you're using, and the intensity of
UV light -- determine whether reaction will occur. It also makes
a difference if you have Rosacea or if you have PCT, VP or HCP.
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. This
includes the minocycline which is a common medication for
Rosacea. With some patients it can sometimes up to several
months) after they've finished the medication.
Because photosensitivity is so hard to predict, the best approach
is to prevent reactions by always protecting your
skin. In VP and HCP along with the PCT, avoiding the sun and sun
reflection such as snow glare or water glare from a lake, is
important. And just because you are separated from the sun
by a pane of window glass does not mean you are protected.
Photosensitivity may happen quickly (sometimes in as little as 10
minutes), so even the time it takes to walk to the store, wash
the car, or mow the lawn or shovel the snow out of the driveway
on a bright winter's day, it can be enough to cause a reaction in
some people.