Description of Antispasmodic Drugs – PST04211 Basic Pharmacology
NTA Level 4 • Semester 2 • PST04211 Description of Antispasmodic Drugs Basic Pharmacology • Source Session/Topic 26 Full source-text version: all educational wording from the extracted learning source is retained; only presenter/tutor metadata and web-layout noise are removed, while formatting is improved for readability. Session 26: Description of Antispasmodic Drugs Total Session Time: 60 minutes Prerequisites • None Learning Tasks By the end of this session students are expected to be able to: • List indications of antispasmodic drugs • List Contraindication of antispasmodic drugs • Describe dose, dosage and course of antispasmodic drugs • List side effects and adverse effects of antispasmodic drugs • Describe interaction and precaution of antispasmodic drugs Resources Needed: • Flip charts, marker pens, and masking tape • Black/white board and chalk/whiteboard markers • Computer and LCD SESSION OVERVIEW Activity/ Step Time Content Method 1 05 minutes Presentation Introduction, Learning Tasks Presentation 2 10 minutes Indications of antispasmodic drugs Brainstorming Presentation 3 05 minutes Contraindications of antispasmodic drugs Buzzing Dose, dosage and course of antispasmodic 4 10 minutes Presentation drugs Presentation Side effects and adverse effects of 5 10 minutes Brainstorming antispasmodic drugs Interactions and precautions of antispasmodic 6 10 minutes Presentation drugs 7 05 minutes Presentation Key Points 8 05 minutes Presentation Evaluation PST 04211 Basic Pharmacology NTA Level 4 Semester 2 Facilitator Guide 159 SESSION CONTENTS STEP 1: Presentation of Session Title and Learning tasks (5 minutes) READ or ASK students to read the learning tasks and clarify ASK students if they have any questions before continuing. STEP 2: Indications of Antispasmodic Drugs (10 minutes) Activity: Brainstorming (5 minutes) ASK students to pair up and buzz on the following question for 2 minutes • What are the indications of antispasmodic drugs? ALLOW few pairs to respond and let other pairs to add on points not mentioned WRITE their response on the flip chart/board CLARIFY and SUMMARIZE by using the content below • Antispasmodic drugs are relaxants of intestinal smooth muscles. o They include drugs such as Atropine sulfate, Dicycloverine hydrochloride, Belladonna and Hyoscine butyl-bromide • Indications The smooth muscle relaxant properties of anti-muscarinic and other antispasmodic drugs may be useful in providing symptomatic relief gastro-intestinal disorders characterized by smooth muscle spasms, especially in: o Dysmenorrhea ( Hyoscine butyl-bromide) o Irritable bowel syndrome o Diverticular disease ( a condition associated with lower abdominal pain, anorexia, fevers and disturbed bowel habit) STEP 3: Contraindication of antispasmodic drugs (5 minutes) Activity: Buzzing (5 minutes) Ask students to brainstorm on the following question: • What are the contraindications of antispasmodic drugs? ALLOW few students to respond WRITE their responses on the flip chart/ board PST 04211 Basic Pharmacology NTA Level 4 Semester 2 Facilitator Guide 160 CLARIFY and SUMMARISE by using the content below • Anti-muscarinic drugs are contraindicated in myasthenia gravis • Dicyclomine hydrochloride is contraindicated to infants under 6 months STEP 4: Dose, Dosage and Course of Antispasmodic Drugs (10 minutes) • Atropine sulfate o 0.6-1.2 mg at night • Dicycloverine hydrochloride o 10–20mg 3 times daily; INFANT 6–24 months 5–10mg 3–4 times daily, 15 minutes before feeds; CHILD 2–12 years 10mg 3 times daily • Belladonna o 12.5mg every 8 hours • Hyoscine butyl-bromide o By mouth: smooth muscle spasm, 20mg 4 times daily; CHILD 6– 12 years, 10mg 3 times daily. Irritable bowel syndrome, 10mg 3 times daily, increased if required up to 20mg 4 times daily o By intramuscular or slow intravenous injection, acute spasm and spasm in diagnostic procedures, 20mg repeated after 30 minutes if necessary (may be repeated more frequently in endoscopy), max. 100mg daily STEP 5: Side effects and adverse effects of antispasmodic drugs (10 minutes) Activity: Brainstorming (5 minutes) Ask students to brainstorm on the following question: • What are the side effects and adverse effects of Antispasmodic drugs ALLOW few students to respond? WRITE their responses on the flip chart/ board CLARIFY and SUMMARISE by using the content below Side and adverse effects of Antispasmodics drugs: • Anti-muscarinic drugs have side effects which include o Constipation o Transient bradycardia (followed by tachycardia, palpitation and arrhythmias) o Reduced bronchial secretions o Urinary urgency and retention PST 04211 Basic Pharmacology NTA Level 4 Semester 2 Facilitator Guide 161 o Dilatation of the pupils with loss of accommodation o Photophobia o Dry mouth o Flushing o Dryness of the skin • Side-effects that occur occasionally include: o Confusion (particularly in the elderly) o Nausea o Vomiting o Giddiness o Angle-closure glaucoma may occur. STEP 6: Interaction and Precaution of Antispasmodic Drugs (10 minutes) • Antimuscarinics should be used with caution in Down‘s syndrome, in children and in the elderly • They should also be used with caution in gastro-oesophageal reflux disease • Diarrhoea • Ulcerative colitis • Hypertension STEP 7: Key points (5 minutes) • These are relaxants of intestinal smooth muscles • They are useful in providing symptomatic relief 0f gastro-intestinal disorders characterized by smooth muscle spasms, especially in irritable bowel syndrome • They are contraindicated in myasthenia gravis • Their common side effects include: Constipation, urinary retention, dry mouth and dryness of the skin • They should be used with caution in Down‘s syndrome, in children and in the elderly STEP 7: Evaluation (5 minutes) • What are the indications of antispasmodic drugs? • What are the contraindications of antispasmodic drugs? • What are the side effects and adverse effects of antspasmodic drugs? • What are the interactions and precautions of antispasmodic drugs? PST 04211 Basic Pharmacology NTA Level 4 Semester 2 Facilitator Guide 162 References Ministry of Health and Social Welfare. (2013). Standard Treatment Guidelines & National Essential Medicines List Tanzania Mainland (4th ed.). Dar es salaam, Tanzania government printers. Robert L. Talbert, Gary C. Yee, Gary R. Matzke, Barbara G. Wells &, L. Michael. (2014). Pharmacotherapy: a pathophysiologic approach (9th ed.). New York, McGraw-Hill Education. Sally S.R & Jeanne C.S. 2000. Introductory Clinical Pharmacology (6th ed) New York, Lippincott Williams and Wilkins School of Pharmaceutical sciences. (2011).Tanzania Pharmaceutical Handbook (2nd ed.). Dar es Salaam,