- Ubidecarenone
- Ubiquinone
- Ubrogepant
- Udenafil
- Ufenamate
- Ulifloxacin
- Ulipristal
- Umbelliferyl
- Umckalin
- Umeclidinium
- Umeclidinium Bromide
- Umifenovir
- Undecanoic Acid
- Undecylenic Acid
- Uniconazole
- Upadacitinib
- Upamostat
- Uprosertib
- Uracil
- Urapidil
- Urea
- Urethane
- Uridine
- Urocanic
- Urocanic Acid
- Urolithin
- Urolithin A
- Urolithin B
- Uroporphyrin
- Ursocholic Acid
- Ursodeoxycholic
- Ursodeoxycholic Acid
- Ursodiol
- Usnoflast