CliffBio
small molecule

VALCHLOR

MECHLORETHAMINE HYDROCHLORIDE

Loss of exclusivityJuly 2029latest FDA-listed patent expiry
CompanyHELSINN BIREX PHARMACEUTICALS LTD

Drug detail

Brand nameVALCHLOR
Active ingredientMECHLORETHAMINE HYDROCHLORIDE
StrengthEQ 0.016% BASE
Dosage formGEL
RouteTOPICAL
ModalitySmall molecule
FDA approvalAugust 2013
Marketing statusRX

Listed patents

PatentExpiresType
7872050July 2029use U-1427
8501819March 2026use U-1427
8450375March 2026product
8501818March 2026product
7838564March 2026product
9382191March 2026product

Source: FDA Orange Book, layered on the CliffBio company graph. Cliff dates are the latest FDA-listed patent expiry; estimates are projections, not legal advice.

VALCHLOR patent cliff — loss of exclusivity July 2029 | CliffBio