- Saccharin
- Saquinavir
- Scopolamine
- Secobarbital
- Selegiline
- Senna
- Sertraline
- Silicone Breast Implants
- Simethicone
- Simvastatin
- Sodium Iodide
- Sodium Iodide 125I
- Sodium Iodide 131I
- Somatostatin
- Sotalol
- Sparfloxacin
- Spectinomycin
- Spiramycin
- Spironolactone
- Stavudine
- St. John’s Wort
- Streptokinase
- Streptomycin
- Succinylcholine
- Sucralfate
- Sufentanil
- Sulfasalazine
- Sulfonamides
- Sulindac
- Sumatriptan
