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Aniracetam

Compound with anti-depressive properties used as a mental performance enhancer.

2,5-di-tert-butylhydroquinone

Dibromothymoquinone

At low concentrations, this compound inhibits reduction of conventional hydrophilic electron acceptors, probably acting as a plastoquinone antagonist.

Bithionol

Bithionol, formerly marketed as an active ingredient in various topical drug products, was shown to be a potent photosensitizer with the potential to cause serious skin disorders.

Methapyrilene

Methapyrilene, formerly marketed in many drug products, was shown to be a potent carcinogen. Manufacturers voluntarily withdrew methapyriline drug products from the market in May and June 1979.

Nomifensine

FDA published a notice of its determination that Merital capsules were removed from the market for safety reasons (see the Federal Register of June 17, 1986 (51 FR 21981)).

Lysergic acid diethylamide

Many emotionally intense experiences can lead to flashbacks when a person is reminded acutely of the original experience. … Some say HPPD is a manifestation of post-traumatic stress disorder, not related to the direct action of LSD on brain chemistry, and varies according to the susceptibility of the individual to the disorder

Mepenzolate

Pharmacologically, it is a post-ganglionic parasympathetic inhibitor. … Mepenzolate is a post-ganglionic parasympathetic inhibitor. It decreases gastric acid and pepsin secretion and suppresses spontaneous contractions of the colon.

Celiprolol

It is simultaneously a selective β1 receptor antagonist, a β2 receptor partial agonist and a weak α2 receptor antagonist. … In 2010 a clinical trial has suggested a use for this medication in the prevention of vascular complications of a rare inherited disease called vascular Ehlers–Danlos syndrome.

Biricodar

The pipecolinate derivative biricodar (VX-710) is a clinically applicable modulator of P-glycoprotein (Pgp) and multidrug resistance protein (MRP-1).