All the above four medicines can be safely taken during pregnancy, none of them cause any fetal malformations.
You will have to continue these medicines throughout pregnancy. You should be under continuos care of your gynaecologist and physician throughout pregnancy and follow their advice.
In my opinion you are on wrong advise. Forecox is same as rehz and adding only streptomycin to failing treatment is not good. Get culture and sensitivity for afb and add four new anti tb drugs under supervision of respiratory physician.
Forecox Tablet is used in spinal B successfully if you take the full course of 9 months (or more if needed) and it is a combination of four medicines: Isoniazid, rifampicin, ethambutol and pyrazinamide which treat tuberculosis. Isoniazid works by preventing the TB bacteria from forming their own protective covering, while rifampicin inactivates a bacterial enzyme (RNA-polymerase) which is required by TB bacteria to make essential proteins and to reproduce. Together, they kill the bacteria and eradicate the infection. Ethambutol and pyrazinamide, on the other hand work by slowing the growth of these bacteria.
MBBS, M.D Pulmonary Medicine, DNB - Respiratory Medicine, Fellow in Pulmonary Critical Care
Increase dose of ethambutol to 1000 mg if no side effects to it.
Can also increase dose of rifampicin to 500 mg (50 mg in form of syp).
If tolerated pza can also be increased to 1500 mg .kindly confirm with your doctor as side effects are common with att.