P1E1, P2E1, P3E1, P4E1, P6E1, brand names for fixed-combination ophthalmic drugs containing a cholinergic (pilocarpine hydrochloride) and an adrenergic (epinephrine bitartrate). The numbers indicate the percentage of each ingredient in the solution; for example, P2E1 contains 2% pilocarpine hydrochloride and 1% epinephrine bitartrate. Brand name for pilocarpine hydrochloride, epinephrine bitartrate.
