Paclitaxel is a chemotherapeutic drug originally developed from the bark of the Pacific Yew tree. Given the relative scarcity of Pacific Yew trees and environmental concerns over their loss, scientists sought to synthesize the product but settled instead on semisynthesizing it from the needle of the English Yew, a procedure now used in the creation of Bristal-Myers Squibb's Taxol. Paclitaxel was approved by the FDA in 1992 for use in the treatment of ovarian cancer and in 1994 for use in the treatment of breast cancer. It is not a cure for cancer but it may stop the abnormal cancer cells from dividing and growing so they eventually die.

A 5-HT3 inhibitor used to control emesis secondary to chemotherapy.

Pantoprazole is a prescription medication used to treat heartburn, erosive esophagitis, and related symptoms of gastroesophageal reflux disease. Sold under the brand name Protonix.

Papaverine is used to relax blood vessels and thus improve blood flow in patients with circulatory problems.

Generic name: paricalcitrol. Brand name: Zemplar.

Enzyme replacement therapy for the treatment of severe combined immunodeficiency disease (SCID).

An antifolate antineoplastic agent

Indicated for the relief of bladder pain or discomfort associated with interstitial cystitis.

perflutren lipid microspheres - a diagnostic contrast medicine

Permethrin is a synthetic insecticide used in the treatment of lice infestations.

Phentermine is used as a short-term supplement to diet and exercise in the treatment of obesity.

Vasomax (Phentolamine mesylate), a treatment for sexual dysfuntion from Zonangen and Schering-Plough.

Decongestant, formerly used in many USA over-the-counter medications, but no longer considered safe.

A miotic (parasympathomimetic) used to control intraocular pressure.

Indicated for short-term and intermittent long-term thearpy in the treatment of mild to moderate atopic dermatitis.

Pioglitazone is used in the treatment of diabetes.

Medication with antipsychotic properties and weak sedative activity.

Indicated for the treatment of the signs and symptoms of idiopathic Parkinson's disease.

A trematodicide for the treatment of schistosome infections and infections due to liver fluke.

A uricosuric agent used in the treatment of gout.

Prochlorperazine is used to treat severe nausea and vomiting. A brand name is Compazine.

A female hormone used for postmenopausal hormone replacement therapy and the treatment of secondary amenorrhea.

Propranolol is a nonselective beta-adrenergic receptor blocking agent (beta blocker) possessing no other autonomic nervous system activity. Specifically competes with beta-adrenergic receptor stimulating agents for available receptor sites. It is used in the treatment of hypertension.

Indicated for treatment of patients with known or suspected internal contamination with radioactive cesium and/or radioactive or non-radioactive thallium.

Decongestant medication, structurally similar to amphetamine.

Pycnogenol is an antioxidant found in the bark of the maritime pine (Pinus maritima) and the Canadian spruce (Tsuga canadensis) and in grape seeds.

Pyrethrins, known as pediculicides, are extracted from dried pyrethrum flowers (a member of the same genus as the chrysanthemum) and are used as an insecticide,especially to kill head and body lice in humans. They are frequently paired with piperonyl butoxide which makes the pyrethrins more effective.