Active substance

Diphenhydramine

2 products from 2 companies contain this in United States.

2 without prescriptionTabletCapsule, Liquid Filled

Available without a prescription

Histaprin25 mgWithout prescriptionTablet NorMed · Diphenhydramine Nightime Sleep Aid50 mgWithout prescriptionCapsule, Liquid Filled Velocity Pharma · Diphenhydramine

Same substance is not the same product. Strength, form, release mechanism and other ingredients all differ. Whether one can replace another is a decision for a pharmacist.