Pyrvinium (Viprynium) is an anthelmintic effective for pinworms. Pyrvinium is used in the treatment of enterobiasis caused by Enterobius vermicularis (pinworm). Pyrvinium has being shown to be a potent inhibitor of Wnt signaling (EC(50) of ∼10 nM). Pyrvinium binds all casein kinase 1 (CK1) family members in vitro at low nanomolar concentrations and pyrvinium selectively potentiates casein kinase 1α (CK1α) kinase activity. Pyrvinium pamoate (PP) is a potent noncompetitive inhibitor of the androgen receptor (AR). A noncompetitive AR inhibitor pyrvinium has significant potential to treat CRPC, including cancers driven by ligand-independent AR signaling.

Diphenadione is a vitamin K antagonist that exhibits anticoagulant effects and is used as a rodenticide against rats, mice, voles, ground squirrels and others. When orally ingested it is toxic to mammals causing irregular heartbeat and major maladies associated with its impact on blood clotting. It is also used in South America to control vampire bat populations.

HYDROXYDIONE is a neuroactive steroid used formerly as a general anesthetic. It was discontinued due to a high incidence of post-anesthetic thrombophlebitis, delayed onset of anesthesia and an unacceptably long duration of action.

Pipenzolate bromide (JB-323), an anticholinergic agent, which binds to muscarinic acetylcholine receptors as an antagonist. Pipenzolate bromide was studied as an antispasmodic agent, and to treat peptic ulcer.

Pentoxyverine is a non-opioid antitussive used to prevent cough caused by common cold. It is used as an active ingredient of several oral over-the-counter cough suppressants alone or in combination with other medications, especially decongestants. Certuss is a combination of pentoxyverine and guaifenesin. Pentoxyverine is FDA pregnancy category C drug. Known as anticonvulsant, and spasmolytic agent.

Iproniazid is a non-selective, irreversible monoamine oxidase inhibitor (MAO) of the hydrazine class. It was originally developed for the treatment of Tuberculosis, but in 1952, its antidepressant properties were discovered when researchers noted that patients given isoniazid became inappropriately happy. Iproniazid is no longer clinically prescribed and has been withdrawn due to incidences of hepatotoxicity.

Pipradrol (Meratran) is a psychoactive agent and a central nervous system stimulant useful in the field of psychiatry. In vitro study has shown that pipradrol inhibits the reuptake of and stimulates the release of dopamine and norepinephrine. In these pharmacodynamic actions it is less potent than d-amphetamine. It was shown that pipradrol conditioned place preference (CPP) was blocked by selective D1 dopamine antagonist SCH23390 suggesting that a rewarding effect of pipradrol establishment of a CPP may involve activation of D1 dopamine receptors. Pipradrol was initially used as an adjunct in the dietary management of obesity as well as for the treatment of dementia. There have been a number of reports on the properties of pipradrol showing its favorable effects in the treatment of depression and fatigue status as well as a variety of other conditions including narcolepsy, spasmodic torticollis, schizophrenia and in geriatric practice. Pipradrol has a definite cerebral stimulating effect without affecting the blood pressure or respiration and has been used to counteract post-anasthetic and chlorpromazine depression in man. Structurally related to -phenylmethylamphetamine, a potent stimulant with a long half-life, pipradrol differs from amphetamine in that its action is more intense at higher centres, it lacks pressor activity, there is no post-excitement depression, and it does not depress the desire for food as occurs with amphetamine. The drug however is enhancing the existing pathologic behavior such as exacerbating pre-existing anxiety and is considered the drug of abuse. Meratran has certain indications and contraindications. Indications are schizophrenics without delusions having restriction of interest and activity and with depressant features, psycho-motor retardation and/or blocking of communication, long-term hospitalized schizophrenics with severe deterioration while contraindications are patients with delusions, anxiety, disturbed patients with cerebral arteriosclerosis. Pipradrol was made illegal in many countries in 1970s due to its abuse potential. It is classified under the Misuse of Drugs Act as a Class C substance. The combination of pipradrol with multivitamins and minerals marketed as Alertonic Elixir is used as adjunctive therapy in combating fatigue resulting from emotional or nutritional causes.

Pentoxyverine is a non-opioid antitussive used to prevent cough caused by common cold. It is used as an active ingredient of several oral over-the-counter cough suppressants alone or in combination with other medications, especially decongestants. Certuss is a combination of pentoxyverine and guaifenesin. Pentoxyverine is FDA pregnancy category C drug. Known as anticonvulsant, and spasmolytic agent.

Procyclidine is a muscarinic antagonist that crosses the blood-brain. Procyclidine hydrochloride (brand name Kemadrin) is a synthetic antispasmodic compound of relatively low toxicity. It has been shown to be useful for the symptomatic treatment of parkinsonism (paralysis agitans) and extrapyramidal dysfunction caused by tranquilizer therapy. Procyclidine hydrochloride was developed at The Wellcome Research Laboratories as the most promising of a series of antiparkinsonism compounds produced by chemical modification of antihistamines. Kemadrin is indicated in the treatment of parkinsonism including the postencephalitic, arteriosclerotic, and idiopathic types. Partial control of the parkinsonism symptoms is the usual therapeutic accomplishment. Procyclidine hydrochloride is usually more efficacious in the relief of rigidity than tremor; but tremor, fatigue, weakness, and sluggishness are frequently beneficially influenced. It can be substituted for all the previous medications in mild and moderate cases. For the control of more severe cases, other drugs may be added to procyclidine therapy as indications warrant. The mechanism of action is unknown. It is thought that procyclidine acts by blocking central cholinergic receptors, and thus balancing cholinergic and dopaminergic activity in the basal ganglia. Pharmacologic tests have shown that procyclidine hydrochloride has an atropine-like action and exerts an antispasmodic effect on smooth muscle. It is a potent mydriatic and inhibits salivation. It has no sympathetic ganglionblocking activity in doses as high as 4 mg/kg, as measured by the lack of inhibition of the response of the nictitating membrane to preganglionic electrical stimulation.

Pentoxyverine is a non-opioid antitussive used to prevent cough caused by common cold. It is used as an active ingredient of several oral over-the-counter cough suppressants alone or in combination with other medications, especially decongestants. Certuss is a combination of pentoxyverine and guaifenesin. Pentoxyverine is FDA pregnancy category C drug. Known as anticonvulsant, and spasmolytic agent.