Yohimbe - Pausinystalia johimbe (in the Rubiaceae or Madder family)
Part used: Bark.
Taste/smell: Taste not very distinguishable, slightly astringent.
Dosage: Small amounts of the alkaloid have shown results while larger doses loose the desired clinical effect.
Use: (a) Impotence.
The alkaloid, yohimbine, has been used successfully with male erectile dysfunction, orthostatic hypotension and narcolepsy. It appears to work by blocking alpha-2 adrenergic receptors.
Contraindications: 15-20 milligrams of yohimbine alkaloid can induce hypertension; 12 milligrams can induce a hypertensive crises if taken with tricyclic antidepressants; 10 milligrams can induce mania in bipolar disease; 15 milligrams have been associated with bronchospasm.