Denatonium, usually available as denatonium benzoate (trade names Bitrex) is the most bitter chemical compound known, with bitterness thresholds of 0.05 ppm for the benzoate and 0.01 ppm for the saccharide. Scientists at Macfarlan Smith, Ltd. of Edinburgh, Scotland discovered Bitrex during research on derivatives of the anesthetic lidocaine. The extremely bitter taste proved effective in reducing ingestion by humans and animals. Denatonium is commonly included in placebo medications used in clinical trials to match the bitter taste of certain medications. Denatonium activates bitter taste receptor, mainly, TAS2R4, TAS2R8, TAS2R10, TAS2R13 on many cell types and plays important roles in chemical release, ciliary beating and smooth muscle relaxation through intracellular Ca(2+)-dependent pathways.

Chlorprothixene (Taractan, Tarasan, Truxal) is a thioxanthine derivative developed by Lundbeck for the treatment of psychotic disorders. The drug exerts its activity by binding to and inhibiting serotonin receptors, dopamine receptors, muscarinic acetylcholine receptor, histamine H1 receptor and alpha1-adrenergic receptor.

ETRYPTAMINE (MONASE®), similar to the hallucinogenic tryptamines, is an inhibitor of monoamine oxidase, introduced for use as an antidepressant. It was withdrawn from the market due to problems with agranulocytosis and other side effects. However, it's activity is still under scientific investigation.

Oxyphenisatin is a stimulant laxative that has been used by mouth and as an enema. Oxyphenisatin was introduced as Lavema by Winthrop in US in 1959. Oxyphenisatin was used as a cleansing enema apart from x-ray studies and prior to urinary, gastro-intestinal and cholecystography x-ray examination. Oxyphenisatin was also used for preoperative preparation of the large intestine and colon. May be mixed with barium for x-ray examination of the large intestine. Oxyphenisatin may cause jaundice. Oxyphenisatin-induced liver damage usually occurs when the drug has been taken for at least six months and usually two years. Oxyphenisatin was withdrawn in most countries in the early 1970s.

Protoveratrine A, the principal alkaloid of Veratrum album, has been used in the treatment of hypertension but has largely been replaced by drugs with fewer adverse effects.

Protoveratrine B is one of two alkaloids isolated from the plant Veratrum albumen. The main effect of both alkaloids is vasodilation in all vascular beds thereby reducing blood pressure. In the 1950's it was recognized that Protoveratrine B is the preferred compound which can be administered at significantly higher doses before the patient begins to vomit.

Pregnenolone sulfate is an endogenous neurosteroid with excitatory effects in the brain, acting as a potent negative allosteric modulator of the GABAA receptor, a positive allosteric modulator of the NMDA receptor, and activator of transient receptor potential cation channel TRPM1 and TRPM3. In the model of schizophrenia, treatment with pregnenolone sulfate normalized the hyperlocomotion and stereotypic bouts, and rescued the PPI deficits of dopamine transporter knockout mice. Promnesic properties of pregnenolone sulfate were demonstrated in rat models of spatial memory performance.

Cortisone is a hormone that is FDA approved for the treatment of primary and secondary adrenocortical deficiency, rheumatic disorders, psoriasis, exfoliative dermatitis, bronchial asthma, allergic conjunctivitis, hemolytic anemia, enteritis, tuberculosis, trichnosis. Cortisone acetate binds to the cytosolic glucocorticoid receptor. After binding the receptor, the newly formed receptor-ligand complex translocates itself into the cell nucleus, where it binds to many glucocorticoid response elements (GRE) in the promoter region of the target genes. The DNA bound receptor then interacts with basic transcription factors, causing the increase in expression of specific target genes. Common adverse reactions include convulsions, increased intracranial pressure with papilledema, vertigo, headache, psychic disturbances, hirsuitism, glaucoma, exophthalmos. Aminoglutethimide may lead to a loss of corticosteroid-induced adrenal suppression. Co-administration of corticosteroids and warfarin usually results in inhibition of response to warfarin, although there have been some conflicting reports. Cortisone is a natural steroid hormone. Its sulfate analog has been detected in in umbilical vein blood fetus plasma between 19 and 32 weeks of gestation with a significant increase at 29-30 weeks and in amniotic fluid. Base on the experiments with rats it was suggested that cortisone sulfate in mammals could be hydrolyzed enzymatically liberating sulfate ions from cortisone. Cortisone sulfate has been proposed for use as one of the glycosaminoglycan compound materials in a cartilage prosthesis and biological nasal bridge implant manufacture as well as auxiliary agent in powder aerosol composition for use in baby powder, dry shampoo, water-eczema remedy and antiperspirant.

Tetraethylammonium is an experimental drug with no approved indication or marketed formulation. Tetraethylammonium blocks of apamin-sensitive and insensitive Ca2(+)-activated K+ channels. It is a weak agonist of the nicotinic receptor. Tetraethylammonium produces transient reductions in blood pressure. Tetraethylammonium hydroxide is used as a soluble source of hydroxide ions and in the synthesis of ionic organic compounds.