Dihydergot

Dihydergot Uses, Dosage, Side Effects, Food Interaction and all others data.

A 9,10alpha-dihydro derivative of ergotamine. It is used as a vasoconstrictor, specifically for the therapy of migraine disorders.

Dihydergot is indicated for the acute treatment of migraine headaches with or without aura and the acute treatment of cluster headache episodes. Dihydergot binds with high affinity to 5-HT1Da and 5-HT1Db receptors. It also binds with high affinity to serotonin 5-HT1A, 5-HT2A, and 5-HT2C receptors, noradrenaline a2A, a2B and a receptors, and dopamine D2L and D3 receptors. The therapeutic activity of Dihydergot in migraine is generally attributed to the agonist effect at 5-HT1D receptors.

Trade Name Dihydergot
Availability Prescription only
Generic Dihydroergotamine
Dihydroergotamine Other Names 9,10-dihydroergotamine, Dihidroergotamina, Dihydroergotamin, Dihydroergotamine, Dihydroergotaminum, Diidroergotamina
Related Drugs Ubrelvy, Botox, prednisone, diclofenac, celecoxib, metoclopramide, sumatriptan, verapamil, indomethacin, Imitrex
Type
Formula C33H37N5O5
Weight Average: 583.6774
Monoisotopic: 583.279469319
Protein binding

93% (to plasma proteins)

Groups Approved, Investigational
Therapeutic Class
Manufacturer
Available Country
Last Updated: September 19, 2023 at 7:00 am
Dihydergot
Dihydergot

Uses

Dihydergot is an ergot alkaloid used in the acute treatment of migraine headache and cluster headache.

For the acute treatment of migraine headaches with or without aura and the acute treatment of cluster headache episodes.

Dihydergot is also used to associated treatment for these conditions: Cluster Headache, Deep vein thrombosis postoperative, Migraine, Pulmonary Embolism

How Dihydergot works

Two theories have been proposed to explain the efficacy of 5-HT1D receptor agonists in migraine: 1) activation of 5-HT1D receptors located on intracranial blood vessels, including those on arterio-venous anastomoses, leads to vasoconstriction, which correlates with the relief of migraine headache and 2) activation of 5-HT1D receptors on sensory nerve endings of the trigeminal system results in the inhibition of pro-inflammatory neuropeptide release.

Toxicity

Side effects include abdominal pain, abnormal speech, coma, confusion, convulsions, hallucinations, increase and/or decrease in blood pressure, nausea, numbness, tingling, pain, and a bluish color of your fingersand toes, slowed breathing, vomiting

Food Interaction

  • Avoid grapefruit products. Grapefruit inhibits the metabolism of dihydroergotamine through the CYP3A4 pathway and, therefore, may increase serum levels of dihydroergotamine. Use caution if co-administering.

[Moderate] MONITOR: Grapefruit juice may increase the plasma concentrations of orally administered drugs that are substrates of the CYP450 3A4 isoenzyme.

The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit.

Because grapefruit juice inhibits primarily intestinal rather than hepatic CYP450 3A4, the magnitude of interaction is greatest for those drugs that undergo significant presystemic metabolism by CYP450 3A4 (i.e., drugs with low oral bioavailability).

In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands.

Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition.

Pharmacokinetic interactions involving grapefruit juice are also subject to a high degree of interpatient variability, thus the extent to which a given patient may be affected is difficult to predict.

MANAGEMENT: Patients who regularly consume grapefruit or grapefruit juice should be monitored for adverse effects and altered plasma concentrations of drugs that undergo significant presystemic metabolism by CYP450 3A4.

Grapefruit and grapefruit juice should be avoided if an interaction is suspected.

Orange juice is not expected to interact with these drugs.

Dihydergot Hypertension interaction

[Major] The use of ergot alkaloids is contraindicated in patients with conditions predisposing them to vasospastic reactions, including, ischemic heart disease (angina, history of myocardial infarction, silent ischemia), peripheral vascular disease, sepsis, shock, vascular surgery, uncontrolled hypertension, and severely impaired hepatic or renal function.

The vasoconstriction produced be ergot alkaloids may exacerbate these conditions.

Ergot alkaloids may cause vasospastic reactions other than coronary artery vasospasm such as peripheral vascular reactions, and colonic ischemia, causing muscle pains, numbness, coldness, pallor, and cyanosis of the digits.

In patients with compromised circulation, persistent vasospasm may result in gangrene or death.

Nitroprusside and heparin have been used to treat ergotamine- induced severe vasoconstriction.

Dihydergot Disease Interaction

Major: vasospastic reactions

Volume of Distribution

  • 800 L

Elimination Route

Interpatient variable and may be dependent on the administration technique

Half Life

9 hours

Clearance

  • 1.5 L/min

Elimination Route

The major excretory route of dihydroergotamine is via the bile in the feces. Only 6%-7% of unchanged dihydroergotamine is excreted in the urine after intramuscular injection.

Innovators Monograph

You find simplified version here Dihydergot

*** Taking medicines without doctor's advice can cause long-term problems.
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