The price of Isotretinoin in Singapore for 10mg (daily dose for 1 month) can range from $ 65 - 80 for generic Isotretinoin.
The cost can be $100 - $130 for branded Isotretinoin. As such, the price range for Isotretinoin in Singapore can be significant.
Based on personal anedotal experience, I am quite happy to use Acnotin (generic Isotretinoin) as patients who have taken the branded Isotretinoin in my clinic have expressed a sensation of "feeling unwell" or general fatigue that they didn't feel on Acnotin.
Duration of treatment for Isotretinoin: this varies based on your condition. It can range from 6 - 12 months, and varies based on your dosage taken, as well as whether you can tolerate the side effects. There are indeed many variables - I would suggest you consult your doctor to discuss further.
Winston