Hydergine
A mixture of hydrogenated ergot alkaloids; a classic prescription nootropic with modest cognitive effects.
Pharmacology
Contents
WHAT IS HYDERGINE?
Detailed overview
Hydergine is the brand name for ergoloid mesylates (dihydroergotoxine): a mixture of the methanesulfonate salts of four hydrogenated ergot alkaloids. It blocks alpha-adrenergic signaling while acting as a partial agonist at dopamine D2 and serotonin receptors, and it also influences brain energy metabolism and shows antioxidant properties experimentally. Originally introduced as a cerebral vasodilator, the modulation of synaptic neurotransmission is now regarded as its more significant action. A Cochrane meta-analysis of dementia trials found a modest but measurable cognitive effect with good tolerability; it has largely been phased out of practice as newer cholinesterase inhibitors emerged. It is a prescription medicine.
Mechanism
Alpha-blockade + D2/5-HT partial agonism
Half-life
Roughly 2-4 hours (active components, variable)
Legal status
Prescription medicine (ergoloid mesylates)
Receptor profile
- Alpha-adrenergic receptors (antagonism)Strong
- Dopamine D2 receptors (partial agonism)Moderate
- Serotonin (5-HT) receptorsModerate
- Brain energy metabolism / mitochondriaWeak
Safety
Side effects, stop signs, contraindications
Side effects · 6
- Nausea and gastrointestinal upset, especially when taken without food
- Nasal congestion and stuffiness
- Lightheadedness, dizziness, orthostatic drop in blood pressure (from alpha-blockade)
- Transient oral mucosa irritation with sublingual dosing
- Bradycardia (slow heart rate) in sensitive patients
- Rare ergot-related fibrosis (retroperitoneal, pulmonary or cardiac valve) with prolonged high-dose use
Contraindications · 5
- Acute or chronic psychosis: ergot alkaloids may aggravate it
- Known ergot alkaloid hypersensitivity or allergy
- Pregnancy and breastfeeding: ergot derivatives should be avoided
- Severe bradycardia or low blood pressure
- Use caution with other ergot derivatives, dopaminergic or serotonergic agents due to additive effects
Related Nootropics
Same therapeutic category
Studies
Related research and clinical findings
Hydergine for dementia
Olin J, Schneider L, Novit A, Luczak S
Overview of clinical trials of hydergine in dementia
Schneider LS, Olin JT
Ergoloids and ischaemic strokes; efficacy and mechanism of action
Winblad B, et al.
Pharmacologic management of Alzheimer disease, Part II: Antioxidants, antihypertensives, and ergoloid derivatives
Doody RS
Bioavailability of ergoloid mesylates liquid capsule
Weber W, et al.
FAQ
FAQ
A mixture of hydrogenated ergot alkaloids; a classic prescription nootropic with modest cognitive effects.
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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.