Introduction Triptans are a class of drugs primarily used in the acute treatment of migraine and cluster headaches. They are selective serotonin receptor agonists, specifically targeting the 5-HT1B and 5-HT1D subtypes. By reversing the pathophysiological mechanisms of migraine, triptans help relieve headache, nausea, photophobia, and phonophobia. Common drugs in this class include sumatriptan, rizatriptan, and … Read more
Introduction Glucagon is a peptide hormone secreted by the alpha cells of the pancreas. It plays a crucial role in glucose homeostasis by raising blood glucose levels, especially during fasting states. Clinically, it is used in the emergency treatment of severe hypoglycemia, as well as in diagnostic procedures involving the gastrointestinal tract. Glucagon acts via … Read more
Introduction Oxybutynin is an antimuscarinic agent used primarily in the treatment of overactive bladder (OAB) and urinary incontinence. It reduces urinary urgency and frequency by inhibiting involuntary bladder contractions. Its dual mechanism—anticholinergic and direct smooth muscle relaxant properties—makes it effective for bladder control with additional benefits in neurogenic bladder conditions. Mechanism of Action (Step-wise) 1. … Read more
Introduction Lactulose is a synthetic disaccharide used primarily for the treatment of hepatic encephalopathy and constipation. As a non-absorbable sugar, it exerts its effects locally in the colon through osmotic activity and modulation of gut flora. Its dual action—both osmotic laxative and ammonia-reducing agent—makes it a unique therapeutic agent in hepatic and gastrointestinal conditions. Mechanism … Read more
Introduction Orlistat is a lipase inhibitor used primarily as an anti-obesity agent. It acts locally within the gastrointestinal tract to reduce the absorption of dietary fats. Unlike centrally acting appetite suppressants, orlistat exerts its effect peripherally without affecting the central nervous system. This makes it a valuable pharmacologic option for long-term weight management in obese … Read more
Introduction Budesonide is a potent, non-halogenated glucocorticoid used primarily for its anti-inflammatory and immunosuppressive properties. It is commonly employed in the management of asthma, chronic obstructive pulmonary disease (COPD), inflammatory bowel disease (IBD), and allergic rhinitis. Budesonide’s localized activity and high first-pass metabolism reduce systemic exposure, making it a preferred option for targeted anti-inflammatory therapy. … Read more
Introduction Pregabalin, marketed under the brand name Lyrica, is a centrally acting agent approved for neuropathic pain, epilepsy, and generalized anxiety disorder. Although structurally similar to gamma-aminobutyric acid (GABA), pregabalin does not bind to GABA receptors. Instead, it exerts its effects by modulating calcium channels in the central nervous system, leading to decreased neurotransmitter release … Read more
Introduction Lubiprostone is a chloride channel activator used primarily to manage chronic idiopathic constipation, irritable bowel syndrome with constipation (IBS-C), and opioid-induced constipation. Unlike traditional laxatives, lubiprostone targets specific ion channels on the gastrointestinal epithelium to enhance fluid secretion and promote intestinal motility. This unique mechanism ensures more physiologic bowel movements with minimal systemic absorption. … Read more
Introduction Bicalutamide is a non-steroidal antiandrogen used primarily in the treatment of prostate cancer. It acts by blocking the action of androgens, which are critical in the development and progression of prostate malignancies. Unlike steroidal antiandrogens, bicalutamide offers selective androgen receptor antagonism with fewer hormonal side effects, making it an important drug in androgen deprivation … Read more
Introduction Finasteride is a synthetic 4-azasteroid that functions as a competitive and specific inhibitor of type II 5-alpha-reductase, the enzyme responsible for the conversion of testosterone to dihydrotestosterone (DHT). DHT is a potent androgen involved in the pathogenesis of benign prostatic hyperplasia (BPH) and androgenetic alopecia. By reducing DHT levels, finasteride alleviates symptoms associated with … Read more
