Eserinum. Eserine. Physostigmine. The alkaloid of Physostigma venenosum, Calabar Bean. C15 H21 N3 O2. Trituration or solution.   Clinical.-Blepharospasm. Ciliary spasm. Glaucoma. Headache. Pupil, contracted. Salivation. Sweat, excessive.   Characteristics.-Eserine