Galantamine
Amaryllis-alkaloid Alzheimer's drug: reversible cholinesterase inhibitor with a dual cholinergic mechanism.
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Pharmacology
Contents
WHAT IS GALANTAMINE?
Detailed overview
Galantamine is a tertiary alkaloid originally isolated from the bulbs of Amaryllidaceae plants (such as snowdrop and daffodil) and now an approved prescription drug for the symptomatic treatment of mild-to-moderate Alzheimer's disease. It is a dual-mechanism cholinergic agent: it reversibly inhibits the acetylcholine-degrading enzyme acetylcholinesterase, and it acts as an allosteric potentiating ligand that amplifies the response of nicotinic acetylcholine receptors to their own transmitters. Numerous randomized, placebo-controlled trials have confirmed its modest cognitive and functional benefit in Alzheimer's disease, and off-label it is well known for stimulating lucid dreaming, supported by a 2018 double-blind, placebo-controlled crossover study. It is a prescription medicine requiring medical supervision.
Mechanism
Reversible AChE inhibitor + nicotinic APL
Half-life
Approximately 7-8 hours
Legal status
Prescription drug (Alzheimer's)
Receptor profile
- Nicotinic acetylcholine receptors (allosteric potentiation)Strong
- Acetylcholinesterase (reversible inhibition)Moderate
- Cognitive decline / memoryModerate
Safety
Side effects, stop signs, contraindications
Side effects · 6
- Nausea and vomiting, especially early during dose titration (the most common complaint)
- Reduced appetite and weight loss
- Dizziness, headache, fatigue
- Diarrhea or abdominal cramps from increased cholinergic gastrointestinal activity
- Bradycardia (slow heart rate), fainting and rarely heart block from increased vagal tone
- Vivid dreams or disrupted sleep if dosed close to bedtime
Contraindications · 6
- Severe hepatic or renal impairment: dose adjustment or avoidance required
- Bradycardia, sick sinus syndrome or other supraventricular conduction disorders: increased risk of heart block
- Active or predisposed peptic ulcer disease due to increased gastric acid secretion
- Asthma or severe obstructive pulmonary disease: cholinergic action may trigger bronchospasm
- Strong CYP2D6 or CYP3A4 inhibitors (e.g. paroxetine, ketoconazole) raise exposure
- Prescription medicine: not recommended without medical supervision and diagnosis
Related Nootropics
Same therapeutic category
Studies
Related research and clinical findings
Pre-sleep treatment with galantamine stimulates lucid dreaming: A double-blind, placebo-controlled, crossover study
LaBerge S, LaMarca K, Baird B
Acute response to cholinergic challenge predicts long-term response to galantamine treatment in patients with Alzheimer's disease
Baakman AC, Gavan C, van Doeselaar L, et al.
Comparative Efficacy and Acceptability of Cholinesterase Inhibitors and Memantine Based on Dosage in Patients With Alzheimer's Disease
Shi X, et al.
The Cholinergic Drug Galantamine Alleviates Oxidative Stress Alongside Anti-inflammatory and Cardio-Metabolic Effects in Subjects With the Metabolic Syndrome in a Randomized Trial
Sangaleti CT, Katayama KY, De Angelis K, et al.
Feasibility and effects of galantamine on cognition in humans with cannabis use disorder
Sugarman DE, Poling J, Sofuoglu M
FAQ
FAQ
Amaryllis-alkaloid Alzheimer's drug: reversible cholinesterase inhibitor with a dual cholinergic mechanism.
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Structure & chemistry
The information here is strictly for educational and scientific purposes. It does not replace medical advice or clinical consultation, and it does not encourage illegal substance or pharmaceutical use. Data is sourced. When in doubt, consult your doctor.