Generic name: Ergoloid mesylates.

Other brand names: Gerimal, Hydergine-LC.

Hydergine is a vasodilator. It dilates the blood vessels, thereby increasing blood flow to the brain. 

Quick Facts About Hydergine


Used to treat symptoms of age-related declining mental capacity.

Hydergine Dosage

Take exactly as prescribed. Dissolve sublingual tablets under the tongue; do not crush or chew. May take weeks to regulate dosage and observe results; should continue taking.

  • Usual adult dose: 1 milligram taken 3 times per day.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: skip missed dose; go back to regular schedule. Do not double doses.

Hydergine Side Effects

Overdose symptoms:

no specific information available. If you suspect an overdose, immediately seek medical attention.

Side effects: irritation below the tongue (if taking sublingual tablets), stomach upset, temporary nausea.

No known less common or rare Hydergine side effects.


No Hydergine drug interactions reported.

No known food/other substance interactions. 

Special Cautions

Not used by women of childbearing age.

No special precautions apply to seniors.

Not generally prescribed for children.

  • Do not use if allergic to or sensitive to this medication, or if you have a mental disorder.
  • Doctor should do a thorough analysis before prescribing Hydergine and then closely monitor for any changes.


HealthSurvey.org provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Hydergine side effects, please contact your healthcare provider.