Thanks for your question on Healthcare Magic.
I can understand your concern.
Yes, anti tubercular drugs like isoniazid,
pyrazinamide and
rifampicin can cause skin itching and rashes.
Since these are essential tubercular drugs, we can not stop them.
So we are giving antihistamine (levocetrizine or
fexofenadine) and anti allergic (
montelukast) combination.
Mometasone cream is also effective for local application for itching.
Also wear cotton undergarments only.
Avoid moisture and perspiration in private parts. Keep proper hygiene of private part.
Drink plenty of fluids orally and keep your self hydrated.
Sit in warm water with antiseptic solution for at least 10 minutes in a day.
Don't worry, you will be alright with all these.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.