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1. Antiemetics & Prokinetic drugs Objectives:
Mechanism of vomiting.
Receptors involved in the process of emesis.
Antiemetic drugs, mechanism, uses & S/E.
Management of motion sickness, vertigo, Menier’s disease & vomiting in pregnancy.
Prokinetic drugs, mechanism, uses, S/E.
2. Vomiting center Physiology of vomiting
4. Receptors involved in the emesis process
5. Antiemetic Drugs
9. Other antiemetics:
Glucocorticoids (dexamethasone & methylprednisolone)
Nabilone (a synthetic cannabinoid).
Glucocorticoids & nabilone are used in cytotoxic drugs-induced vomiting.
10. Drugs used in treatment of motion
sickness:
Antimuscarinic: hyoscine.
Antihistaminic H1-blockers (having antimuscarinic action): cinnarizine, Cyclizine, dimenhydrinate & promethazine.
11. Vomiting during pregnancy:
Reassurance.
Rarely it needs drug therapy e.g. cyclizine or promethazine (preferred).
Pyridoxine & multivitamins plus i.v fluids in severe vomiting as that with hyperemesis gravidarum
12. Vertigo Labyrinthine disorders & Menier's syndrome Cyclizine or prochlorperazine in acute attack.
Betahistine (histamine analogue).
Cinnarizine (antihistaminic, calcium channel blocker & antimuscarinic)
These drugs are used in hope to improve the blood circulation in the inner ear.
13. Prokinetic Drugs (Metoclopramide & domperidone)
The Prokinetic drugs produce the following
effects:
Hasten esophageal clearance.
Increase tone of the gastro-esophageal sphincter.
Accelerate gastric emptying.
Antiemetic effects by dopamine (D2) blockade.
15. Uses:
GERD, nonulcer dyspepsia, vomiting, diabetic gastropathy, emergency evacuation of stomach before surgery, and hiccup