Hi, Actually, Forecox has four anti TB drugs in it. Yes there are side effects of these meds . Keep an eye on the following: * Gastrointestinal (GI) symptoms: Common GI symptoms include nausea, vomiting, diarrhea, and abdominal pain. These symptoms can be managed with medications or changes in diet. * Liver toxicity: Anti-TB medications can sometimes cause liver toxicity, which can lead to symptoms such as jaundice, fatigue, and abdominal pain. Regular liver function tests are usually done to monitor for liver toxicity. * Allergic reactions: Allergic reactions to anti-TB medications can be serious and even life-threatening. Symptoms can include rash, itching, fever, and difficulty breathing. * Peripheral neuropathy: Some anti-TB medications can cause peripheral neuropathy, which is damage to the nerves that control sensation and movement in the arms and legs. Symptoms can include tingling, numbness, and muscle weakness. * Vision problems: Certain anti-TB medications can cause vision problems, including color blindness, blurred vision, and difficulty focusing. * Joint pain: Anti-TB medications can cause joint pain and swelling, especially in the knees Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. H. Kay, General & Family Physician