- Sotalol
- Soyalac
- Span-FF
- Sparfloxacin
- Spaslin
- Spasmoban
- Spasmolin
- Spasmophen
- Spasquid
- Spec-T Sore Throat Anesthetic
- Spectazole
- Spectinomycin
- Spectracef
- Spectro-Caine
- Spectro-Chlor Ophthalmic Ointment
- Spectro-Chlor Ophthalmic Solution
- Spectro-Cyl
- Spectro-Genta
- Spectro-Homatropine
- Spectro-Sporin
- Spectro-Sulf
- Spectrobid
- Spectrocin Plus containing Neomycin Sulfate, Bacitracin Zinc, Lidocaine, and Polymyxin B Sulfate
- Spermicides
- Spersacarpine
- Spersadex
- Spersaphrine
- Spiramycin
- Spiriva
- Spiriva HandiHaler
- Spironazide
- Spironolactone
- Spironolactone and Hydrochlorothiazide
- Spirozide
| - Sporanox
- St. Joseph Adult Chewable Aspirin
- St. Joseph Aspirin-Free Fever Reducer for Children
- St. Joseph Cold Tablets for Children containing Acetaminophen and Phenylpropanolamine Hydrochloride
- Stadol
- Stadol Injection
- Stadol NS
- Stagesic
- Stahist
- Stalevo
- Stalevo (combination with entacapone)
- Stalevo (combination with levodopa/carbidopa)
- Stamoist E
- Staphcillin
- Starlix
- Statex
- Statex Drops
- Staticin
- Statuss Green
- Stavudine
- Stay Moist Moisturizing Lip Conditioner
- Stelazine
- Stelazine Concentrate
- Stemetic
- Stemetil
- Stemetil Liquid
- Sterapred
- Sterapred DS
- Steri-Units Sulfacetamide
- Stieva-A
- Stieva-A Forte
- Stimate
- Stimate Nasal Spray
| - Stimulant Laxatives
- Stool Softeners
- Storz-Dexa
- Storzolamide
- Stoxil
- Strattera
- Streptase
- Streptozocin
- Stri-Dex Dual Textured Pads Maximum Strength
- Stri-Dex Dual Textured Pads Regular Strength
- Stri-Dex Dual Textured Pads Sensitive Skin
- Stri-Dex Maximum Strength Pads
- Stri-Dex Regular Strength Pads
- Stri-Dex Super Scrub Pads
- Striant
- Strifon Forte DSC
- Stromectol
- Strontium Chloride Sr 89
- Strontium-89 Chloride
- Student's Choice Acne Medication
- Su-Phedrin
- Sublimaze
- Succimer
- Sucraid
- Sucralfate
- Sucrets 4 Hour Cough Suppressant
- Sucrets Maximum Strength
- Sucrets Regular Strength
- Sucrets, Children's
- Sudafed
- Sudafed 12 Hour
- Sudafed 12 Hour Caplets
- Sudafed 24 Hour
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