The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
- Injection site reactions, such as bruising, redness, or swelling (37-62%)
- Constipation (14-22%)
- Weakness or lack of energy (11-21%)
- Headache (9-13%)
- Diarrhea (8-9%)
- Stomach pain (7%)
Less Common Side Effects
- Trouble sleeping
- Stomach upset
- Dizziness
- Muscle weakness
- Heartburn
Sustol ER serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Serotonin syndrome: fast heart rate, dizziness, sweating, flushing, tremor (shakiness), muscle stiffness, muscle twitching or spasms, uncoordinated movement, distress, seizures, distress, hallucinations, coma
- Serious allergic reactions: dizziness, feeling lightheaded, rash, hives, trouble breathing, pounding heart, swelling of your face, lips, tongue, or throat
Source: DailyMed
The following Sustol ER side effects have also been reported
Side effects that you should report to your care team as soon as possible:
- Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
- Bowel blockage—stomach cramping, unable to have a bowel movement or pass gas, loss of appetite, vomiting
- Irritability, confusion, fast or irregular heartbeat, muscle stiffness, twitching muscles, sweating, high fever, seizure, chills, vomiting, diarrhea, which may be signs of serotonin syndrome
- Skin infection—skin redness, swelling, warmth, or pain at the injection site
Side effects that usually do not require medical attention (report these to your care team if they continue or are bothersome):
- Constipation
- Diarrhea
- Dizziness
- Fatigue
- Headache
- Pain, redness, irritation, or bruising at the injection site
- Stomach pain
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