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Serious side effects are very uncommon, but may include suppression of the bone marrow, hepatitis, low blood sugar, or an autoimmune syndrome. Common side effects include nausea, skin rash, itching, abdominal pain, joint or muscle pains, or headache. The warnings and precautions for the use of the drug include close monitoring for signs of infection or hepatitis, such as fever, sore throat, right upper abdominal pain, but there are no measures that can be taken to avoid or prevent the side effects.
The length of therapy depends upon the underlying condition and the overall treatment plan. Some people are on it to control the acute episode, but others may be on the medicine for longer periods of time. The liver is the primary location for metabolism of many medicines and can be irritated by some of the medicines, causing hepatitis.