A composition match, not medical advice.
D-Well 400IU Drop 15 Drop contains Vitamin D3 (Cholecalciferol) 400IU, as a drop. It is made by Sun Pharmaceutical Industries Ltd.
No, it is sold over the counter. Ask a doctor or pharmacist if you are unsure whether it suits you.
Yes. Cholecalciferol (Vitamin D3) Drops 400 IU per ml is a Jan Aushadhi medicine with the same salt, the same strength and the same form. On JanAushadhiOnline it costs ₹18.75 for 15 mls (₹1.3 / ml), against ₹5.3 / ml for D-Well 400IU Drop 15 Drop at its printed MRP — 76% less per ml. Ask your doctor before changing a brand.