NEET MDS Lessons
Pharmacology
PLASMA FRACTIONS:
a) Fresh frozen plasma.
b) Platelets.
c) Plasma concentrates.
d) Non-plasma recombinant factor concentrates.
Ketorolac
Mechanism of action
primary action responsible for its anti-inflammatory/antipyretic/analgesic effects is inhibition of prostaglandin synthesis through inhibition of the enzyme cyclooxygenase (COX). Ketorolac is not a selective inhibitor of COX enzymes
Indications: short-term management of pain
Contraindications
hypersensitivity to ketorolac, and against patients with the complete or partial syndrome of nasal polyps, angioedema, bronchospastic reactivity or other allergic manifestations to aspirin or other non-steroidal anti-inflammatory drugs (due to possibility of severe anaphylaxis).
Celecoxib
is a highly selective COX-2 inhibitor and primarily inhibits this isoform of cyclooxygenase, whereas traditional NSAIDs inhibit both COX-1 and COX-2. Celecoxib is approximately 10-20 times more selective for COX-2 inhibition over COX-1.
Being a sulphonamide can cause skin rash & hypersensitivity rxn., occasional oedema& HT.
Indication
Osteoarthritis ( 100‐200mg BID ) , rheumatoid arthritis, dysmenorrhea, acute gouty attacks, acute musculoskeletal pain.
Chloral hydrate
1. Short-acting sleep inducer—less risk of “hangover” effect the next day.
2. Little change on REM sleep.
3. Metabolized to trichloroethanol, an active metabolite; further metabolism inactivates the drug.
4. Used for conscious sedation in dentistry.
5. Can result in serious toxicity if the dose is not controlled.
Drugs Used in Diabetes
Goals of diabetes treatment
lower serum glucose to physiologic range
keep insulin levels in physiologic range
eliminate insulin resistance
best initial step in management: weight loss, contractile-based exercise weight loss is more important for insulin sensitivity than is a low-carb diet
Modalities of diabetes treatment
Type I DM
insulin
low-sugar diet
Type II DM
exercise
diet
insulin
6 classes of drugs
Insulin
Sulfonylureas - Glyburide
Meglitinides - Nateglinide
Biguanides Metformin
Glitazones (thiazolidinediones) Pioglitazone
α-glucosidase inhibitors Acarbose
GLP-1 mimetics (incretin mimetics) Exenatide
Amylin analog Pramlintide
Lithium carbonate: 1st choice (controls mania in bipolar disorders); delay before onset of therapeutic benefit; no psychotropic effects in normal humans
i. Mechanism: blocks enzymes in inositol phosphate signaling pathway; no consistent effects of lithium on NE, 5-HT, and DA
ii. Side effects: severe CNS (ataxia, delirium, coma, convulsions) and CV (cardiac dysrhythmias)
Aquaretics
An aquaretic is a class of drug that is used to promote aquaresis, the excretion of water without electrolyte loss.
Lithium, demeclocycline
Mechanism of Action
1. Block ADH action on distal tubule and collecting duct. Blocking ADH decreases H2O permeability. H2O is not recovered (distal tubule) using osmotic draw of counter-current multiplier so aquaretics reduce water reabsorption (tubule to blood stream).
2. Net effect is an increase in free water clearance