Colazal Side Effects
Generic Name: balsalazide
Note: This page contains information about the side effects of balsalazide. Some of the dosage forms included on this document may not apply to the brand name Colazal.
Not all side effects for Colazal may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
For the Consumer
Applies to balsalazide: oral capsule, oral tablet
Along with its needed effects, balsalazide (the active ingredient contained in Colazal) 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 while taking balsalazide:More common
- Bloody diarrhea
- skin rash
- Bladder pain
- bloody or cloudy urine
- bloody stools
- difficult, burning, or painful urination
- frequent urge to urinate
- heavy bleeding
- lower back or side pain
- Difficult or labored breathing
- shortness of breath
- tightness in the chest
- Abdominal or stomach pain or tenderness
- clay colored stools
- dark urine
- decreased appetite
- decreased frequency or amount of urine
- general feeling of tiredness or weakness
- increased blood pressure
- increased thirst
- joint pain
- light-colored stools
- loss of appetite
- nausea and vomiting
- stomach pain, continuing
- swelling of the face, fingers, feet, or lower legs
- unpleasant breath odor
- unusual tiredness or weakness
- vomiting of blood
- weight gain
- yellow eyes or skin
Some side effects of balsalazide 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:More common
- mild headache
- muscle aches
- sore throat
- stuffy or runny nose
- Acid or sour stomach
- bloated or full feeling
- body aches or pain
- bone pain
- difficulty with moving
- dry mouth
- dryness of the throat
- excess air or gas in the stomach or intestines
- general feeling of discomfort or illness
- muscle pain or stiffness
- pale skin
- passing of gas
- stomach discomfort or upset
- swelling or inflammation of the mouth
- swollen joints
- tender, swollen glands in the neck
- trouble with sleeping
- trouble with swallowing
- troubled breathing with exertion
- unable to sleep
- unusual bleeding or bruising
- voice changes
- weight loss
- Back pain
- ear congestion
- loss of appetite
- loss of voice
- pain in the ankles or knees
- painful, red lumps under the skin, mostly on the legs
- unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
- Hair loss or thinning of the hair
For Healthcare Professionals
Applies to balsalazide: oral capsule, oral tablet
During clinical trials, the most common side effects reported with the capsule formulation were headache, abdominal pain, diarrhea, nausea, vomiting, respiratory infection, and arthralgia. Some side effects (including abdominal pain, fatigue, and nausea) were reported more often in women than in men. Abdominal pain, rectal bleeding, and anemia can be part of the clinical presentation of ulcerative colitis.
During a clinical trial, the most common side effects reported in male patients taking the tablet formulation were headache, nasopharyngitis, anemia, diarrhea fatigue, pharyngolaryngeal pain, and urinary tract infection. Most side effects were mild to moderate in severity. The most common serious side effects were gastrointestinal disorders, which were primarily associated with symptoms of ulcerative colitis.
Gastrointestinal side effects have included abdominal pain (up to 6%), diarrhea (up to 5%), nausea (5%), vomiting (up to 4%), dyspepsia (2%), flatulence (up to 2%), anorexia (2%), dry mouth (up to 1%), constipation (up to 1%), defecation urgency (less than 1%), hard feces (less than 1%), gastroesophageal reflux disease (less than 1%), and gastroenteritis (less than 1%). Pancreatitis has been reported during postmarketing experience.
Musculoskeletal side effects have included arthralgia (up to 4%), musculoskeletal pain (2.4%), myalgia (up to 1%), and back pain (less than 1%).
Respiratory side effects have included nasopharyngitis, respiratory infection (4%), pharyngolaryngeal pain (3.7%), coughing (2%), pharyngitis (2%), rhinitis (2%), dyspnea (less than 1%), and upper respiratory infection (less than 1%). Pleural effusion, pneumonia (with and without eosinophilia), and alveolitis have been reported during postmarketing experience.
Nervous system side effects have included headache (8%), insomnia (up to 2.4%), lethargy (less than 1%), and dizziness (less than 1%).
Hepatic side effects have included elevated aspartate aminotransferase (less than 1%). Hepatotoxicity, including elevated liver function tests (SGOT/AST, SGPT/ALT, GGT, LDH, alkaline phosphatase, bilirubin), jaundice, cholestatic jaundice, cirrhosis, hepatocellular damage (including liver necrosis and liver failure), and Kawasaki-like syndrome (including hepatic function changes) have been reported during postmarketing experience of products that contain (or are metabolized to) mesalamine; some cases were fatal.
Hematologic side effects have included anemia (3.7%), thrombocythemia, and prothrombin changes. A higher incidence of blood dyscrasias (i.e., neutropenia and pancytopenia) has been reported during uncontrolled clinical trials and postmarketing experience in patients 65 years or older receiving mesalamine-containing products.
Cardiovascular side effects have included increased blood pressure (less than 1%), increased heart rate (less than 1%), hypertension, palpitations, and bradycardia. Myocarditis, pericarditis, and vasculitis have been reported during postmarketing experience.
Renal side effects have included renal failure and interstitial nephritis during postmarketing experience.
Other side effects have included fatigue (up to 2%), fever (2%), cramps (1%), influenza-like disorder (1%), pyrexia (less than 1%), face edema (less than 1%), malaise (less than 1%), pain (less than 1%), and swelling (less than 1%).
Genitourinary side effects have included urinary tract infection (up to 3.7%).
Dermatologic side effects have included erythema nodosum (less than 1%) and rash (less than 1%). Pruritus and alopecia have been reported during postmarketing experience.
More about Colazal (balsalazide)
- Other brands: Giazo
Related treatment guides
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