A vial price is not a protocol cost, and comparing a ₱2,800 vial against a ₱12,650 Wegovy pen without adjusting for what the pen includes is the most common mistake I see. Four things move the research-route number upward.
Consult and prescription. An endocrinology consult at a major hospital runs ₱1,500 to 2,500. That is a cost on the pharmacy route and a cost you should be paying on the research route too, because a baseline assessment is not optional just because nobody is checking.
Supplies. Bacteriostatic water and insulin syringes are separate purchases on the vial route and are bundled into the pen on the pharmacy route. Small money, but it belongs in the column.
Lab work. Private lab panels in this country are cheap and available everywhere, and quarterly panels are the substitute for the pharmacy callback support you are giving up. Budget for them, because the diligence does not disappear when the pharmacist does. It just moves onto your desk.
Shipping and cold-chain. Insulated packaging and temperature-controlled couriers cost real money per order, particularly on the 1 to 3 day provincial runs and particularly through the hot months. A supplier who is not charging for that is probably not doing it.
Add all four and the research route still wins on price, but the margin is a good deal thinner than the vial sticker implies. Against a Wegovy 2.4mg pen at ₱12,650 it wins by roughly two times rather than four. Against an Ozempic pen at ₱7,650 the two routes end up close to each other once consults, supplies, labs and cold-chain shipping are in the column. A comparison that pretends otherwise is marketing rather than analysis.