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| Name | Aliases |
|---|---|
| Oreton (Methyltestosterone) | Android, Estrogen Methyltestosterone DS, Testred, Virilon |
| Orgalutran Injection (Ganirelix (Ganirelix Acetate)) | |
| Orgovyx (Relugolix) | |
| Oriahnn (Elagolix Sodium / Estradiol / Norethindrone Acetate) | |
| Orilissa (Elagolix Sodium) | |
| Orinase (Tolbutamide) | |
| Orkambi (Lumacaftor / Ivacaftor) | |
| Orladeyo (Berotralstat hydrochloride) | |
| Orlistat (Alli) | |
| Orlistat (Xenical) | |
| Orlynvah (Probenecid / Sulopenem Etzadroxil) | |
| Orphenadrine Citrate (Norflex) | |
| Orserdu (Elacestrant Dihydrochloride) | |
| Ortho 0.5/35 Discreet 21 (Ethinyl Estradiol / Norethindrone) | Modicon |
| Ortho Biotic (Lactobacillus Acidophilus / Lactobacillus rhamnosus GG / Lactobacillus plantarum / Lactobacillus Paracasei / Bifidobacterium Bifidum / Saccharomyces boulardii) | |
| Ortho Cyclen (Norgestimate / Ethinyl Estradiol) | Ethinyl Estradiol / Norgestimate |
| Ortho Evra (Ethinyl Estradiol / Norelgestromin) | Evra Patch |
| Ortho Tri-Cyclen (Ethinyl Estradiol / Norgestimate) | |
| Ortho Tri-Cyclen Lo (Norgestimate / Ethinyl Estradiol) | Ethinyl Estradiol / Norgestimate |
| Ortho-Novum 1/35 (Ethinyl Estradiol / Norethindrone) |