16/03/2026
đ Drugs Acting on the Peripheral Nervous System
đŦ Neurohumoral Transmission āĻāϰ āϧāĻžāĻĒ
āύāĻŋāĻāϰā§āĻšāĻŋāĻāĻŽā§āϰāĻžāϞ āĻā§āϰāĻžāύā§āϏāĻŽāĻŋāĻļāύ āĻšāϞ⧠āϏā§āύāĻžāϝāĻŧā§ āĻā§āώ āĻĨā§āĻā§ āϰāĻžāϏāĻžāϝāĻŧāύāĻŋāĻ āĻĒāĻĻāĻžāϰā§āĻĨā§āϰ āĻŽāĻžāϧā§āϝāĻŽā§ āϏāĻāĻā§āϤ āĻĒāϰāĻŋāĻŦāĻšāύāĨ¤
āϧāĻžāĻĒāĻā§āϞ⧠āĻšāϞ⧠â
1ī¸âŖ Neurotransmitter synthesis (āύāĻŋāĻāϰā§āĻā§āϰāĻžāύā§āϏāĻŽāĻŋāĻāĻžāϰ āϤā§āϰāĻŋ)
2ī¸âŖ Storage in vesicles (āĻā§āϏāĻŋāĻā§āϞ⧠āϏāĻāϰāĻā§āώāĻŖ)
3ī¸âŖ Release of neurotransmitter (āϏā§āύāĻžāϝāĻŧā§ āĻĒā§āϰāĻžāύā§āϤ āĻĨā§āĻā§ āύāĻŋāĻāϏāϰāĻŖ)
4ī¸âŖ Binding with receptor (āϰāĻŋāϏā§āĻĒā§āĻāϰā§āϰ āϏāĻžāĻĨā§ āϝā§āĻā§āϤ āĻšāĻāϝāĻŧāĻž)
5ī¸âŖ Biological response (āĻļāϰā§āϰ⧠āĻĒā§āϰāϤāĻŋāĻā§āϰāĻŋāϝāĻŧāĻž āϏā§āώā§āĻāĻŋ)
6ī¸âŖ Termination of action (āĻ
ā§āϝāĻžāĻāĻļāύ āĻŦāύā§āϧ āĻšāĻāϝāĻŧāĻž â reuptake āĻŦāĻž metabolism)
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1ī¸âŖ Cholinergic Drugs
Definition
āϝ⧠āĻāώā§āϧāĻā§āϞ⧠Acetylcholine āĻāϰ āĻŽāϤ⧠āĻāĻžāĻ āĻāϰ⧠āĻŦāĻž cholinergic receptor āϏāĻā§āϰāĻŋāϝāĻŧ āĻāϰā§āĨ¤
Classification
âĸ Direct acting â Bethanechol, Pilocarpine
âĸ Indirect acting â Neostigmine, Physostigmine
Pharmacological Actions
âĸ āĻšā§āĻĻāϏā§āĻĒāύā§āĻĻāύ āĻāĻŽāĻžāϝāĻŧ
âĸ āĻ
āύā§āϤā§āϰā§āϰ āĻāϤāĻŋ āĻŦāĻžāĻĄāĻŧāĻžāϝāĻŧ
âĸ āĻāĻžāĻŽ āĻ āϞāĻžāϞāĻž āĻŦā§āĻĻā§āϧāĻŋ āĻāϰā§
âĸ āĻā§āĻā§āϰ pupil āϏāĻāĻā§āĻāĻŋāϤ āĻāϰā§
Indications
âĸ Glaucoma
âĸ Myasthenia gravis
âĸ Urinary retention
Contraindications
âĸ Asthma
âĸ Peptic ulcer
âĸ Bradycardia
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2ī¸âŖ Anti-Cholinergic Drugs
Definition
āϝ⧠āĻāώā§āϧāĻā§āϞ⧠Acetylcholine āĻāϰ āĻāĻžāĻāĻā§ āĻŦā§āϞāĻ āĻāϰā§āĨ¤
Examples
Atropine, Hyoscine, Ipratropium
Actions
âĸ pupil dilatation
âĸ āĻšā§āĻĻāϏā§āĻĒāύā§āĻĻāύ āĻŦāĻžāĻĄāĻŧāĻžāϝāĻŧ
âĸ āϞāĻžāϞāĻž āĻāĻŽāĻžāϝāĻŧ
Uses
âĸ Bradycardia
âĸ Motion sickness
âĸ Organophosphate poisoning
Contraindications
âĸ Glaucoma
âĸ Prostate enlargement
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3ī¸âŖ Adrenergic Drugs
Definition
āϝ⧠āĻāώā§āϧāĻā§āϞ⧠Adrenaline / Noradrenaline āĻāϰ āĻŽāϤ⧠sympathetic system āĻāĻĻā§āĻĻā§āĻĒāĻŋāϤ āĻāϰā§āĨ¤
Examples
Adrenaline
Noradrenaline
Salbutamol
Actions
âĸ āĻšā§āĻĻāϏā§āĻĒāύā§āĻĻāύ āĻŦā§āĻĻā§āϧāĻŋ
âĸ āϰāĻā§āϤāĻāĻžāĻĒ āĻŦā§āĻĻā§āϧāĻŋ
âĸ Bronchodilation
Uses
âĸ Anaphylactic shock
âĸ Asthma
âĸ Cardiac arrest
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4ī¸âŖ Anti-Adrenergic Drugs
Definition
Sympathetic nervous system āĻāϰ āĻāĻžāϰā§āϝāĻāϞāĻžāĻĒ āĻāĻŽāĻžāϝāĻŧāĨ¤
Examples
Propranolol
Atenolol
Prazosin
Uses
âĸ Hypertension
âĸ Angina
âĸ Arrhythmia
Contraindications
âĸ Severe asthma
âĸ Bradycardia
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5ī¸âŖ Neuromuscular Blocking Agents
Definition
āϝ⧠āĻāώā§āϧāĻā§āϞ⧠skeletal muscle paralysis āϏā§āώā§āĻāĻŋ āĻāϰā§āĨ¤
Examples
Succinylcholine
Vecuronium
Atracurium
Uses
âĸ Surgical anesthesia
âĸ Intubation
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6ī¸âŖ Drugs Used in Myasthenia Gravis
Examples
Neostigmine
Pyridostigmine
Action
Acetylcholine breakdown āĻāĻŽāĻŋāϝāĻŧā§ muscle strength āĻŦāĻžāĻĄāĻŧāĻžāϝāĻŧāĨ¤
Uses
âĸ Myasthenia gravis treatment
âĸ Reversal of muscle relaxant
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7ī¸âŖ Local Anaesthetic Drugs
Definition
āϝ⧠āĻāώā§āϧāĻā§āϞ⧠āϏā§āύāĻžāϝāĻŧā§āϤ⧠pain signal block āĻāϰā§āĨ¤
Examples
Lidocaine
Bupivacaine
Procaine
Uses
âĸ Minor surgery
âĸ Dental procedure
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8ī¸âŖ NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)
Examples
Paracetamol
Ibuprofen
Diclofenac
Aspirin
Actions
âĸ Pain relief
âĸ Fever reduction
âĸ Anti-inflammatory
Indications
âĸ Arthritis
âĸ Fever
âĸ Headache
Contraindications
âĸ Gastric ulcer
âĸ Kidney disease