Cyclophosphamide is biotransformed principally in the liver to active alkylating metabolites by a mixed function microsomal oxidase system. These metabolites interfere with the growth of susceptible rapidly proliferating malignant cells. The mechanis...

Nasal congestion is caused by various etiologies, such as rhinosinusitis and allergic or non-allergic rhinitis, leading to congestion of the venous sinusoids lining the nasal mucosa. Activation of α-adrenergic receptors leads to vasoconstrictio...

Verapamil is an L-type calcium channel blocker with antiarrhythmic, antianginal, and antihypertensive activity. Immediate-release verapamil has a relatively short duration of action, requiring dosing 3 to 4 times daily, but extended-release formulati...

The mechanism of the antidepressant action of venlafaxine in humans is believed to be associated with its potentiation of neurotransmitter activity in the CNS. Preclinical studies have shown that venlafaxine and its active metabolite, O-desmethylvenl...

Vancomycin binds tightly to D-alanyl-D-alanine portion cell wall precursor causing blockage of glycopeptide polymerisation which produces immediate inhibition of cell wall synthesis and secondary damage to the cytoplasmic membrane.

The primary pharmacological action of beta-adrenergic drugs is to stimulate adenyl cyclase, the enzyme which catalyzes the formation of cyclic-3',5' adenosine monophosphate (cyclic AMP) from adenosine triphosphate (ATP). The cyclic AMP thus formed me...

Trimetazidine Dihydrochloride is the first 3- keto acyl CoA thiolase inhibitor (KAT), a metabolic anti-ischemic agent with proven benefits for all coronary patients. Trimetazidine Dihydrochloride inhibits fatty acid pathway by inhibiting 3-keto acyl...

Trihexyphenidyl is a non-selective muscarinic acetylcholine receptor antagonist but binds with higher affinity to the M1 subtype. In vivo studies have shown that trihexyphenidyl demonstrates higher affinity for central muscarinic receptors located in...

Triamcinolone Acetonide (a derivative of Triamcinolone) in a compatible base. Topical steroids are primarily effective because of their anti-inflammatory, antipruritic & vasoconstrictive actions.

Tramadol is a centrally acting synthetic analgesic compound. It inhibits the re uptake of neurotransmitters- serotonin and noradrenaline. Thus it modifies the transmission of pain impulses by activating both descending serotonergic pathways and norad...

Tolperisone Hydrochloride is a centrally acting muscle relaxant, which acts on the central nervous system and used mainly for the treatment of elevated muscle tone and tension as well as for certain circulation problems in the extremities.

Potassium Chloride is used for the treatment of hypokalaemia and of potassium deficiency states. Potassium ion is the principal intracellular cation of most body tissues. It participates in a number of essential physiological processes, including the...

Pethidine is a phenylpiperidine derivative opioid analgesic. It acts mainly as mu-receptor agonist. Like most, opioid analgesics, it mimics endogenous opioids by activating opioid receptors in the central and peripheral nervous system. It reduces the...

Tropicamide binds to and blocks the receptors in the muscles of the eye (muscarinic receptor M4). Tropicamide acts by blocking the responses of the iris sphincter muscle to the iris and ciliary muscles to cholinergic stimulation, producing dilation o...

Pilocarpine Hydrochloride directly stimulates cholinergic receptors. It produces contraction of the iris sphincter muscle, resulting in pupillary constriction (miosis); constriction of the ciliary muscle, resulting in increased accommodation; and red...

Expansol (6% Hydroxyethyl Starch 130/0.4 in 0.9% Sodium Chloride IV infusion) is a clear to slightly opalescent, colorless to slightly yellow, sterile, non-pyrogenic, isotonic solution. The chemical name of Hydroxyethyl Starch is poly (O-2-hydroxyeth...

Prasugrel is an thienopyridine and a prodrug which inhibits ADP receptors by irreversibly acting on the P2Y12 receptor on platelets. The active metabolite of prasugrel prevents binding of adenosine diphosphate (ADP) to its platelet receptor, impairin...

Procyclidine hydrochloride is an antimuscarinic antiparkinsonian agent of relatively low toxicity. It is a synthetic tertiary amine. This drug exerts their antiparkinsonian effect by correcting the relative cholinergic excess which is thought to occu...

Prazosin causes a decrease in total peripheral vascular resistance through selective inhibition of postsynaptic alpha-1-adrenoreceptors in vascular smooth muscle. In hypertensive patients, blood pressure is lowered in both the supine and standing pos...

Pefloxcin is a synthetic antibacterial agent, belongs to fluoroquinolone group. It exerts its action by inhibiting the subunit-A of DNA gyrase (Topoisomerase II). Pefloxcin is bactericidal and has a broad spectrum of activity.