Isobest 10 mg contains isotretinoin, which is a strong vitamin A-derived medicine used for moderate to severe acne, and if this brand is not available, there are many other brands with the same composition (10 mg isotretinoin) such as Tretiva 10, Isac 10, Isokon 10, Tufacne 10, Restoten 10, Ibitret 10, Isotane 10, and Isotroin 10 capsule, which generally work in a similar way because they contain the same active ingredient, isotretinoin. However, since this medicine has important precautions and possible side effects, you should not switch brands or start an alternative on your own, and it is essential to consult your dermatologist to confirm the exact substitute and dose, continue the rest of your prescribed treatment (like antibiotics and creams), and follow regular monitoring for safe and effective acne control.