Proadifen is an inhibitor of drug metabolism and cytochrome P450 enzyme system activity. It stimulated the release of prostacyclin (PGI2) from the rabbit aorta, bovine aorta and human umbilical vein in vitro, but had no effect on cultured smooth muscle from the bovine aortic media. In human platelets, proadifen inhibited prostaglandin and thromboxane production induced by A23187, thrombin, and ADP. Proadifen might thus constitute the prototype of a new class of antiplatelet drugs.

Pirralkonium is the antiseptic agent.

Pravadoline is the anti-nociceptive agent, which has analgesic efficacy against postoperative pain in humans. Pravadoline inhibits the enzyme cyclooxygenase, but in contrast to cyclooxygenase-inhibiting NSAIDs does not produce gastrointestinal irritation. Pravadoline inhibited the synthesis of prostaglandins in mouse brain both in vitro and ex vivo. Pravadoline demonstrated only weak anti-inflammatory activity relative to its anti-nociceptive potency. Single doses of pravadoline were safe and effective in humans, without serious adverse events. Single oral administration of pravadoline maleate induced acute tubular necrosis in male and female beagle dogs.

Pirandamine is the potential antidepressant drug. It is a relatively selective inhibitor of the serotonin uptake mechanism and does not exhibit appreciable norepinephrine uptake blocking activity in contrast to the tricyclic antidepressant drugs imipramine and amitriptyline. Pirandamine is equivalent to amitriptyline and greater than imipramine in potency as a serotonin uptake blocker and a potentiator of central serotonin pharmacological actions, and in contrast, does not exhibit appreciable central anticholinergic effects. Pirandamine potentiated the behavioral effects of 5-hydroxytryptophan in mice. Pirandamine, in contrast to desimipramine and imipramine, did not prevent reserpine-induced hypothermia. The (-)-enantiomer of pirandamine retained the activity of the racemate; the (+I-enantiomer was much less effective.

Auriclosene (previously known as NVC-422) is a broad-spectrum, fast-acting topical anti-infective agent against microbial pathogens, including antibiotic-resistant microbes. It has been investigated in phase II clinical trials for the treatment of bacterial conjunctivitis and as a topical gel in children with impetigo. In addition, using a guinea pig model was shown, that auriclosene was effective in the treatment of dermatophytosis, including onychomycosis.

Hydroxytoluic acid is a long-acting derivative of salicylate with antilipidemic properties. It shows fibrinolytic activity in human plasma by activating the fibrinolytic system and has been shown to lower plasma free fatty acid, cholesterol levels, and to raise metabolic oxygen consumption.

Disiquonium is a quaternary ammonium derivative. It was developed as antiseptic agent.

Droclidinium is the muscarinic receptors antagonist. It is an anticholinergic, spasmolytic agent.