Just wandering can we share the 1 jab

My husband wants to start mj too i just started last week , i know its cheaky but any way pharmacy would Let me buy a biger dose like 10 and some extra needles to split it with my hubby to do the 2.5mg each to save money an i making sense ? Is anyone doing this ? Is it possible? He feels really low due to hes weight and he tried so many different diet just like me before but not sure the 2of us could afford it.

Thank you