Atropine induced paradoxical bradycardia is the sinus bradyarrhythmia following low-dose atropine resulting from the paradoxical slowing in the sinoatrial (SA) node discharge rate. Mechanism of Atropine Induced Paradoxical Bradycardia Central vagotonic effect (blocking M1 acetylcholine receptors in parasympathetic ganglion controlling SA node) of atropine which, at higher doses, is masked…
Tag: Pharmacology
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Pregabalin : Pharmacology
Pharmacokinetics After oral ingestion, Pregabalin is rapidly absorbed (Tmax 1.3 hr) Bioavailability is >90% and independent of dose Pregabalin is NOT protein bound Vd is 0.4 L/kg Serum pregabalin concentrations are linearly related to dosage Pregabalin is NOT metabolized Pregabalin is primarily excreted unchanged in urine (98%) with a clearance…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Enzyme Inducers and Inhibitors : Mnemonic
Cytochrome P450 Inducers Mnemonic: SCRAP GP Sulfonylureas, Smoking Carbamazepine, Corticosteroids Rifamycins (Rifampicin, Rifabutin) Alcohol (Chronic) Phenytoin Griseofulvin Phenobarbital Cytochrome P450 Inhibitors Mnemonic 1: VIDEOCASE Valproate Isoniazid Disulfiram Erythromycin, Clarithromycin (not Azithromycin) Omeprazole Cimetidine Allopurinol Sulfonamides Ethanol (Acute) Mnemonic 2: SICKFACES.COM Sodium valproate Isoniazid Cimetidine Ketoconazole Fluconazole Alcohol (Acute) Chloramphenicol Erythromycin…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Valproic acid (Valproate) : Pharmacology
Dosage and Absorption VPA is absorbed through the small intestine, and delayed- and extended-release forms are designed to extend the dosage interval and bypass the stomach to reduce dyspepsia. The liquid and tablet forms have a more than 10-fold higher absorption rate constant than the extended-release forms and peak at…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Proton Pump Inhibitors (PPI) Pharmacology : Mnemonics
Relative Potency in Omeprazole Equivalent (OE) Mnemonic: PLOwER Pantoprazole (4.5 mg OE) Lansoprazole (13.5 mg OE) Omeprazole (20 mg OE) Esomeprazole (32 mg OE) Rabeprazole (36 mg OE) Side effects of PPI Mnemonic: KFC Kidney (Acute interstitial nephritis) Fractures (Hypochlorhydria leading to decreased serum calcium) C. difficile infection Besides, it…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Opioid Adverse Effects – Mnemonic
Mnemonic: MORPHINES 1. Miosis Mechanism: Stimulation of Edinger-Westphal nucleus of Cranial nerve III 2. Orthostatic hypotension Mechanism: Vasodilation due to – Direct action decreasing tone of blood vessels Histamine release Depression of vasomotor center 3. Respiratory depression Mechanism: Inhibits respiratory center in a dose-dependent manner (neurogenic, hypercapneic and hypoxic drives…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Pharmacology of Carbapenems : Mnemonics
Commonly used Carbapenems Mnemonic: MEDIC Meropenem Ertapenem Doripenem Imipenem/Cilastatin (renal dehydropeptidase I inhibitor) Besides these, there are other drugs like tebipenem (1st oral carbapenem), panipenem, tomopenem (has MRSA activity), etc. which fall under carbapenems. Coverage As the name suggests, they have carbapenems attached to beta-lactam ring which provides protection against…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
FDA Pregnancy Drug Risk Categories : Mnemonic
We have simplified the information above as following: Category A: Adequate Anthropoid (Human) studies and Absolutely safe (No risk in controlled human studies) Category B: Bounded (limited) human studies and safe in Beast (animal) studies; Better to use (No risk in other studies) Category C: Catastrophic effects in animals and…