Yes Nick there are several pharmacies in Negril and they stock most prescriptions. I have filled my blood pressure meds there with a written script from the US dr. and also seen Negril drs and had antibiotics, etc filled there.

Negril Pharmacy is upstairs in the plaza where Valumaster is downtown.
I use the one in Sunshine Plaza (where HiLo is) I think its called Baywatch 876-957-3941 / 4968

Also, Riverside and Key West but not sure of their locations. I would call first to confirm they have what you need.
I have had to go as far as Sav to find some things for locals that Negril was out of.

Good luck and hopefully others will chime in with more info for you.