In a dystopian future where mosquitos have been all but eradicated, manual injections of anti-coagulants are a luxury in which the rich partake. Demand is high and access is highly restricted. On the surface, this is justified through religious ideologies, but at its core it is driven by class discrimination; it is a way for the wealthy to give yet another hearty ****-you to the poor.
As often happens in the case of substances which are both in demand and restricted, a thriving illegal drug trade has emerged. Low-quality anti-coagulants trickle down to the poor, but are, of course, subject to higher sentencing, for the safety of those taking them.
People share needles. Facilities for safe-injections exist, but mostly people prefer to attend ‘injection ******' where they literally scratch each other’s backs.