Can we claim gst input on purchase of bike for business purpose

No...you can't claim itc... If you would purchase a vehicle for transportation of goods / passengers..or imparting training ..then it was possible to claim ITC ... You have purchased the bike for delivering medicines .. You are not in transport business for transporting medicines or passengers.so according to section 17 (5)(a) you can not claim itc 

1. Motor vehicles and other conveyances

The input tax credit on Motor vehicles and other conveyances are not allowed under GST if they are used for personal purpose. However, there is an exception to this condition. If the motor vehicle and other conveyances are used for making the following taxable supplies, the ITC is available on such goods.

• A further supply of such vehicles or conveyances
• Transportation of passengers
• Imparting training on driving, flying, navigating such vehicles or conveyances
• For the transportation of goods

Read more at https://gstindianews.info/input-tax-credit-gst/#ineligible

Thank you for the replies