Famciclovir Side Effects
What should I watch for?
Tell your doctor or health care professional if your symptoms do not improve. This medicine works best when started very early in the course of an infection. Begin treatment at the first signs of infection.
Drink 6 to 8 glasses of water or fluids every day while you are taking this medicine. This will help prevent side effects.
You can still pass the shingles or herpes to another person even while you are taking this medicine. Avoid contact with others as directed. Genital herpes is a sexually transmitted disease. Talk to your doctor about how to stop the spread of infection.
Common and Rare Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Incidence not known
Black, tarry stools
blistering, peeling, or loosening of the skin
blood in urine or stools
joint or muscle pain
loss of appetite
pinpoint red spots on the skin
red, irritated eyes
sores, ulcers, or white spots in the mouth or on the lips
unpleasant breath odor
unusual bleeding or bruising
vomiting of blood
yellow eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Bloated, full feeling
burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feeling
confusion as to time, place, or person
excess air or gas in the stomach or intestines
hives or welts
holding false beliefs that cannot be changed by fact
mood or mental changes
redness of skin
seeing, hearing, or feeling things that are not there
unusual excitement, nervousness, or restlessness
unusual tiredness or weakness
Incidence not known
Sleepiness or unusual drowsiness
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.