My mom is diagnosed with lymph node tb. Doctor recommended tb treatment for 6 months( Rcinex, pyrazinamide and ethambutol for initial two months continued with rcinex, ethambutol for 4 months) she's been undergoing treatment from past 3 months. She's getting urticaria (doctor diagnosed) from past one month. Doctor suspected it might be due to pyrazinamide but, even after pyrazinamide is stopped she's getting urticaria. It's been a month since pyrazinamide is stopped. If in case rifampicin/isoniazid is the cause of it and they have to be stopped, what other drugs are prescribed and for how many months?