- Sibutramine
- Siderol
- Signifor
- Signifor LAR
- Sil-Tex
- Siladryl
- Siladyl
- Silaminic Expectorant
- Silapap
- Sildec DM
- Sildenafil
- Silenor
- Silfedrine
- Silicones
- Siliq
- Silodosin
- Siltane
- Siltuss DAS
- Siltussin
- Siltussin-DM
- Siltuximab
- Silvadene
- Silver
- Silver Compounds
- Silver Nitrate
- Silver Sulfadiazine
- Silver Sulfadiazine, Combinations
- Silymarin
- Simaal Gel
- Simbrinza
- Simcor
- Simeprevir
- Simethicone
- Simfibrate
- Simply Saline
- Simply Saline Wound Wash
- Simply Sleep
- Simponi
- Simponi Aria
- Simron
- Simuc
- Simuc-DM
- Simuc-HD
- Simulect
- Simvastatin
- Simvastatin And Acetylsalicylic Acid
- Simvastatin And Fenofibrate
- Simvastatin, Acetylsalicylic Acid And Ramipril
- Sin-U-Span
- Sina-12X
- Sinapap
- Sinapils
- Sinarest
- Sinarest Nasal
- Sinarest Sinus
- Sincalide
- Sine-Aid
- Sine-Aid IB
- Sine-Off Cold and Cough
- Sine-Off Maximum Strength
- Sine-Off Maximum Strength Reformulated Sep 2008
- Sine-Off Sinus and Cold
- Sinecatechins
- Sinemet
- Sinemet CR
- SINEquan
- Sinex
- Sinex Long-Acting
- Singlet
- Singulair
- Sinucon
- Sinufed
- Sinufed Timecelles
- Sinufrin Plus
- Sinuhist
- Sinulin
- Sinumist
- Sinupan
- Sinutab Ex-Strength
- Sinutab Non Drying
- Sinutab Sinus
- Sinutuss DM
- Sinuva
- Sinuvent
- SINUvent PE
- Siponimod
- Sipuleucel-T
- Sirolimus
- Sirturo
- Sisomicin
- Sitafloxacin
- Sitagliptin
- Sitagliptin & Simvastatin
- Sitavig
- Sitaxentan
- Sitimagene Ceradenovec
- Sitrex
- Sitrex
- Sivextro