- Sabinene
- Sacubitri
- Sacubitril
- Sacubitrilat
- Safinamide
- Salacinol
- Salbutamol
- Salcaprozate
- Salcaprozate Sodium
- Salicylaldehyde
- Salicylic Acid
- Salinomycin
- Salmeterol
- Salmeterol Xinafoate
- Salvianolic Acid
- Samidorphan
- Sancycline
- Saperconazole
- Saponin
- Sappanone B
- Sapropterin
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- Sarafloxacin
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- Sarilumab
- Sarpogrelate
- Satigrel
- Satranidazole
- Saxagliptin
- Scoparone
- Scopolamine
- Sebacic Acid
- Secalonic Acid D
- Secnidazole
- Secophenol
- Segesterone
- Selamectin
- Selank
- Selatinib
- Selegiline
- Selenous Acid
- Selexipag
- Selpercatinib
- Seltorexant
- Selumetinib
- Semaglutide
- Semax
- Semicarbazide
- Senecionine
- Seneciphylline
- Senecivernine
- Senkirkine
- Sennoside
- Sennoside A
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- Sepinol
- Serlopitant
- Serotonin
- Sertaconazole
- Sertraline
- Sethoxydim
- Setmelanotide
- Sevoflurane
- Shikonin
- Shogaol
- Sibutramine
- Siladosine
- Sildenafil
- Sildenafil Citrate
- Silibinin
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- Simazine
- Simendan
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- Simpalon
- Simvastatin
- Sinapic Acid
- Sincalide
- Siphonaxanthin
- Siponimod
- Sirolimus
- Sisafolin
- Sisomicin
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- Sisunatovir
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- Sofosbuvir
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- Sorbitol
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- Sotalol
- Soticlestat
- Sotorasib
- Sotrastaurin
- Sovilnesib
- Soyasaponin
- Sparfloxacin
- Speciociliatine
- Spectinomycin
- Spermidine
- Spermine
- Sphingosine
- Spinosyn
- Spinosyn A
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- Spiramycin
- Spironolactone
- Spirotetramat
- Sponimod
- Staboxol
- Stanozolol
- Staurosporine
- Stavudine
- Stearic Acid
- Stearidonic Acid
- Sterpuric Acid
- Steviol
- Steviolbioside
- Stilbazo
- Stilbesterol
- Stilbestrol
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- Streptomycin
- Streptonigrin
- Strontium
- Strychnidin
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- Styrene
- Succinylcholine
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- Sugammadex
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- Sulbenox
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- Sulfacetamide Sodium
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- Sulfanilamide
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- Sulfasalazine
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- Sulfisomidine
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- Sulindac
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- Sunitinib
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- Suramin
- Surfagon
- Sutezolid
- Suvorexant
- Syringaresinol
- Syringol
- Syringomycin