When he returned to phenelzine, he found it had lost its effectiveness.
From the en.wikipedia.org
Among the antidepressants, amitriptyline may reduce depression, but mianserin, fluoxetine, fluvoxamine and phenelzine sulfate showed no effect.
From the en.wikipedia.org
The purported interaction effects are well-known side effects of phenelzine alone, which had been given in a high dosage and are not at all suggestive of Eleutherococcus.
From the en.wikipedia.org
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Monoamine oxidase inhibitor (trade name Nardil) used to treat clinical depression
Phenelzine (Nardil) is a non-selective and irreversible monoamine oxidase inhibitor (MAOI) of the hydrazine class which is used as an antidepressant and anxiolytic. Along with tranylcypromine and isocarboxazid, phenelzine is one of the few non-selective MAOIs still in widespread clinical use.