
A composition match, not medical advice.

Selsun S 2 in 1 Shampoo+Conditioner 120ml contains Selenium Sulphide 2.5% w/v, as a shampoo. It is made by Abbott Healthcare Pvt. Ltd.
No, it is sold over the counter. Ask a doctor or pharmacist if you are unsure whether it suits you.
Yes. Selenium Sulphide Shampoo 2.5% w/v is a Jan Aushadhi medicine with the same salt, the same strength and the same form. On JanAushadhiOnline it costs ₹174.38 for 120 mls (₹1.5 / ml), against ₹4.5 / ml for Selsun S 2 in 1 Shampoo+Conditioner 120ml at its printed MRP — 67% less per ml. Ask your doctor before changing a brand.