Valacyclovir Side Effects
What should I watch for?
Tell your doctor or health care professional if your symptoms do not start to get better after 1 week.
This medicine works best when taken early in the course of an infection, within the first 72 hours. Begin treatment as soon as possible after the first signs of infection like tingling, itching, or pain in the affected area.
It is possible that genital herpes may still be spread even when you are not having symptoms. Always use safer sex practices like condoms made of latex or polyurethane whenever you have sexual contact.
You should stay well hydrated while taking this medicine. Drink plenty of fluids.
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:
feeling sad or empty
lack of appetite
loss of interest or pleasure
Black, tarry stools
decreased frequency or output of urine
lower back or side pain
reduced mental alertness
shortness of breath
yellow eyes or skin
Incidence not known
Actions that are out of control
back, leg, or stomach pains
blood in urine or stools
change in consciousness
change in mental status
changes in behavior, especially in interactions with other people
changes in patterns and rhythms of speech
dark or bloody urine
difficult or labored breathing
fast, pounding, or irregular heartbeat or pulse
feeling that others are watching you or controlling your behavior
feeling that others can hear your thoughts
feeling, seeing, or hearing things that are not there
general tiredness and weakness
lightheadedness when getting up from a lying or sitting position
loss of consciousness
mood or mental changes
pale color of skin
pinpoint red spots on the skin
pounding in the ears
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
redness of the skin
seeing, hearing, or feeling things that are not there
severe mood or mental changes
shakiness and unsteady walk
shakiness in the legs, arms, hands, or feet
sores, ulcers, or white spots on the lips or in the mouth
swelling of the face, fingers, or lower legs
swollen or painful glands
talking, feeling, and acting with excitement
tightness in the chest
trembling or shaking of the hands or feet
trouble in speaking
unsteadiness, trembling, or other problems with muscle control or coordination
unusual bleeding or bruising
unusual tiredness or weakness
upper right abdominal pain
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:
Body aches or pain
difficulty in moving
loss of voice
muscle pain or stiffness
pain in joints
stuffy or runny nose
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.