Generic name: Isradipine.

DynaCirc is a calcium channel blocker. It increases the amount of oxygen that reaches the heart muscle. 

Quick Facts About DynaCirc


Used to treat high blood pressure.

DynaCirc Dosage

Take exactly as prescribed. Try not to miss doses; condition may worsen if you miss doses. Must take regularly to be effective against high blood pressure, and can take several weeks before full effects are observed. Continue to take even if feeling well.

  • Usual adult dose: 2.5 milligrams 2 times per day. Then may be increased by 5 milligrams per day at 2 to 4 weeks, in intervals up to 20 milligrams per day. If you have kidney or liver disease — 2.5 milligrams 2 times per day. Seniors — effects of drug may be stronger, same dose is prescribed.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose; go back to regular schedule. Do not double doses.

DynaCirc Side Effects

Overdose symptoms:

no specific information available about DynaCirc; however, overdose symptoms associated with calcium channel blockers are drowsiness, severe low blood pressure, slow heartbeat. If you suspect an overdose, immediately seek medical attention.

More common side effects: chest pain, dizziness, fatigue, fluid retention, flushing, headache, pounding heartbeat.

Less common DynaCirc side effects: diarrhea, nausea, rapid heartbeat, rash, shortness of breath, stomach upset, unusually frequent urination, vomiting, weakness. Rare side effects: changes in heartbeat, constipation, cough, decreased sex drive, depression, difficulty sleeping, drowsiness, dry mouth, excessive nighttime urination, excessive sweating, fainting, heart attack, heart failure, hives, impotence, itching, leg and foot cramps, low blood pressure, nervousness, numbness, severe dizziness, sluggishness, stroke, throat discomfort, tingling or pins and needles, vision changes.


Inform your doctor before combining DynaCirc with:

beta-blockers such as Inderal, Lopressor, and Tenormin; carbamazepine (Tegretol); phenytoin (Dilantin).

No known food/other substance interactions.

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. May appear in breast milk; could affect a nursing infant.

Seniors may experience stronger effects of drug; however, dose is not lowered.

Not generally prescribed for children.

  • If sensitive to or allergic reaction to this or other calcium channel blockers, should not take.
  • Monitor for light-headedness or feeling faint; can cause low blood pressure.
  • Use with caution if you have congestive heart failure and are taking beta-blockers.
  • Notify doctor or dentist that you are taking DynaCirc before surgery.


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 DynaCirc side effects, please contact your healthcare provider.