Try calling all the clinics in San Pedro.
Dr Gonzalez 226 2660
Poly Clinic 226 2536
Dr Solorzano 226 2918
Dr Lerida Rodriquez 226 2197
Dr Allison moved but the # I have is 226 4052/ or 603 1755.
If no luck with that, call Community Drug Stores in Belize City 227-2317. They will send it on the plane if you send a check.