Pentasa Side Effects
What should I watch for?
Tell your doctor or health care professional if your symptoms do not start to get better after several days. There is usually an improvement in 3 to 21 days. You may need about 6 weeks of treatment to get good results.
Do not change the brand of this medicine that you are taking without talking to your doctor or health care professional. All brands do not have the same dose.
You may notice the empty shell from this medicine in your stool. If this happens frequently, you should contact your doctor or health care professional.
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:
Less common or rare
Abdominal or stomach cramps or pain (severe)
back pain (severe)
bloody, black, or tarry stools
blue or pale skin
bright red blood in the stool
chest pain, possibly moving to the left arm, neck, or shoulder
nausea or vomiting
stomach cramps, tenderness, or pain
swelling of the stomach
unusual tiredness or weakness
watery or bloody diarrhea
yellow eyes or skin
Incidence not known
Blood in the urine
change in the frequency of urination or amount of urine
difficulty with breathing
general feeling of tiredness or weakness
loss of appetite
lower back or side pain
painful or difficult urination
sores, ulcers, or white spots on the lips or in the mouth
stomach pain, continuing
swelling of the feet or lower legs
unexplained or unusual bleeding or bruising
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:
Abdominal or stomach cramps or pain (mild)
bloated or full feeling
excess air or gas in the stomach or intestines
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.