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Saved to: /tmp/workspace/books/Tara_V_Shanbhag_Pharmacology_for_Dentistry_2nd_Ed.pdf

Detail	Info
Title	Pharmacology for Dentistry
Authors	Tara Shanbhag, Smita Shenoy, Veena Nayak
Edition	2nd Edition
Pages	430
File Size	4.3 MB

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python3 -c " from pypdf import PdfReader reader = PdfReader('/tmp/workspace/books/Tara_V_Shanbhag_Pharmacology_for_Dentistry_2nd_Ed.pdf') results = [] for i, page in enumerate(reader.pages): text = page.extract_text() if text and 'ondansetron' in text.lower(): results.append((i+1, text)) print(f'Found ondansetron on {len(results)} pages:') for pg, txt in results: print(f'\\n===== PAGE {pg} =====') print(txt) "

Here is everything the textbook says about ondansetron, organized by topic:

Ondansetron - Complete Information from Pharmacology for Dentistry (Tara V. Shanbhag, 2nd Ed.)

1. Drug Classification

Ondansetron is the prototype 5-HT₃ receptor antagonist (serotonin receptor blocker).

Other drugs in the same class: granisetron, dolasetron, palonosetron.

(p. 224)

2. Mechanism of Action

The antiemetic effect works through two sites:

Primary: Blockade of 5-HT₃ receptors on vagal afferents in the gut
Secondary: Blockade of 5-HT₃ receptors in the CTZ (chemoreceptor trigger zone) and solitary tract nucleus (STN)

Pathway interrupted by ondansetron:

Anticancer drugs / radiotherapy → Tissue damage in gut → Release of serotonin (5-HT) from enterochromaffin cells of intestinal mucosa → Stimulates vagal afferents via 5-HT₃ receptors → Impulses to CTZ and STN → Vomiting ← blocked by 5-HT₃ antagonists

(p. 224)

3. Pharmacokinetics

Well absorbed after oral administration
Undergoes extensive first-pass metabolism
Metabolites are excreted in urine and faeces
Available for intravenous and intramuscular administration as well
Granisetron is more potent and longer acting than ondansetron

(p. 224)

4. Uses

Use	Details
Anticancer drug-induced nausea & vomiting	Most effective agent; first-line choice
Radiation sickness (post-radiation vomiting)	Effective
Postoperative vomiting	Effective
Hyperemesis of pregnancy	Effective
Alcohol consumption reduction	As a 5-HT₃ antagonist, reduces alcohol consumption (used in alcohol aversion therapy)
Motion sickness	Ineffective

(pp. 224, 185)

5. Adverse Effects

5-HT₃ antagonists are well tolerated. Side effects include:

Headache
Dizziness
Diarrhoea

(p. 224)

6. Use in Preanaesthetic Medication

Ondansetron may be used as a preanaesthetic agent for antiemetic effect - to control postoperative nausea and vomiting alongside metoclopramide and domperidone.

(p. 156 - Preanaesthetic Medication, Objective 4)

7. Use in Cancer Chemotherapy Toxicity

5-HT₃ antagonists such as ondansetron and granisetron are the commonly used antiemetics to manage nausea and vomiting caused by cytotoxic drugs.
Cisplatin is specifically noted as the most emetogenic anticancer drug - its vomiting is controlled by ondansetron or granisetron.
Used in combination with dexamethasone/glucocorticoids (adjuvant antiemetics) - glucocorticoids increase the antiemetic effect of ondansetron.

(pp. 359, 362, 366)

8. Comparison with Other Antiemetics

Drug	Advantage over Ondansetron
Metoclopramide	Prokinetic; useful pre-surgery for gastric emptying
Domperidone	Preferred in children; safe in levodopa therapy
Granisetron	More potent and longer acting than ondansetron
Neuroleptics	NOT as effective as ondansetron in cytotoxic/radiation-induced vomiting

9. Dose & Route (Appendix)

Form	Dose
Tablet (oral)	8 mg PO
Injection (IV)	8 mg IV

(p. 396 - Appendix, Antiemetics)

Summary

Ondansetron is the prototype 5-HT₃ antagonist and the drug of choice for chemotherapy- and radiation-induced vomiting. It works by blocking serotonin receptors on gut vagal afferents and in the CTZ. It is also used in preanaesthetic medication, postoperative vomiting, and hyperemesis of pregnancy, but is not effective for motion sickness. It has an additional role in reducing alcohol consumption. Side effects are minimal - mainly headache, dizziness, and diarrhoea.

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