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Dynacirc Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 2/15/2016

DynaCirc (isradipine) is a calcium channel blocker used to treat high blood pressure (hypertension). DynaCirc is sometimes given with other blood pressure medications. Generic forms of DynaCirc may be available. Common side effects of DynaCirc include dizziness, nausea, vomiting, upset stomach, diarrhea, headache, tiredness, weakness, flushing (warmth, redness, or tingly feeling under the skin), swelling of the ankles/feet, and skin rash or itching.

The recommended dosage of DynaCirc is 1 capsule 2 times daily, or as directed by your doctor. DynaCirc CR may interact with cimetidine, fentanyl, or rifampin. Tell your doctor all medications and supplements you take. Avoid eating grapefruit or drinking grapefruit juice while being treated with this medication. Grapefruit can increase the amount of certain medications in your bloodstream. If you are pregnant, only take DynaCirc if the potential benefit outweighs the potential risk to the fetus. It is not known whether DynaCirc passes into breast milk. Consult your doctor before breastfeeding.

Our DynaCirc (isradipine) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Dynacirc in Detail - Patient Information: Side Effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

  • feeling like you might pass out;
  • feeling short of breath, even with mild exertion;
  • swelling in your hands and feet;
  • fast or pounding heartbeats; or
  • chest pain.

Less serious side effects may include:

  • dizziness;
  • warmth, redness, or tingly feeling under your skin;
  • headache;
  • weakness, tired feeling;
  • nausea, vomiting, diarrhea, upset stomach; or
  • skin rash or itching.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Dynacirc (Isradipine)

What is Patient Information Overview?

A concise overview of the drug for the patient or caregiver from First DataBank.

Dynacirc Overview - Patient Information: Side Effects

SIDE EFFECTS: Dizziness, nausea, headache, tiredness, flushing, and swelling of the ankles/feet may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

To reduce dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur: fainting, fast/irregular/pounding heartbeat.

Tell your doctor immediately if any of these rare but very serious side effects occur: vision changes.

Some people who already have severe heart disease may rarely develop worsening chest pain or a heart attack after starting this medication or increasing the dose. Get medical help right away if you experience: worsening chest pain, symptoms of a heart attack (such as chest/jaw/left arm pain, shortness of breath, unusual sweating).

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire patient information overview for Dynacirc (Isradipine)

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Dynacirc FDA Prescribing Information: Side Effects
(Adverse Reactions)


In multiple dose U.S. studies in hypertension, 1228 patients received DynaCirc® (isradipine) alone or in combination with other agents, principally a thiazide diuretic, 934 of them in controlled comparisons with placebo or active agents. An additional 652 patients (which includes 374 normal volunteers) received DynaCirc® (isradipine) in U.S. studies of conditions other than hypertension, and 1321 patients received DynaCirc® (isradipine) in non-U.S. studies. About 500 patients received DynaCirc® (isradipine) in long-term hypertension studies, 410 of them for at least 6 months. The adverse reaction rates given below are principally based on controlled hypertension studies, but rarer serious events are derived from all exposures to DynaCirc® (isradipine), including foreign marketing experience.

Most adverse reactions were mild and related to the vasodilatory effects of DynaCirc (isradipine) ® (dizziness, edema, palpitations, flushing, tachycardia), and many were transient. About 5% of isradipine patients left studies prematurely because of adverse reactions (vs. 3% of placebo patients and 6% of active control patients), principally due to headache, edema, dizziness, palpitations, and gastrointestinal disturbances.

The following table shows the most common adverse reactions, volunteered or elicited, considered by the investigator to be at least possibly drug related. The results for the DynaCirc® (isradipine) treated patients are presented for all doses pooled together (reported by 1% or greater of patients receiving any dose of isradipine), and also for the two treatment regimens most applicable to the treatment of hypertension with DynaCirc® (isradipine): (1) initial and maintenance dose of 2.5 mg b.i.d., and (2) initial dose of 2.5 mg b.i.d. followed by maintenance dose of 5.0 mg b.i.d.

DynaCirc® (isradipine)

N= All Doses 934 2.5 mg b.i.d. 199 5 mg b.i.d.* 150 10 mg b.i.d. 59 Placebo 297 Active Controls 414
Adverse Experience % % % % % %
Headache 13.7 12.6 10.7 22.0 14.1 9.4
Dizziness 7.3 8.0 5.3 3.4 4.4 8.2
Edema 7.2 3.5 8.7 8.5 3.0 2.9
Palpitations 4.0 1.0 4.7 5.1 1.4 1.5
Fatigue 3.9 2.5 2.0 8.5 0.3 6.3
Flushing 2.6 3.0 2.0 5.1 0.0 1.2
Chest Pain 2.4 2.5 2.7 1.7 2.4 2.9
Nausea 1.8 1.0 2.7 5.1 1.7 3.1
Dyspnea 1.8 0.5 2.7 3.4 1.0 2.2
Abdominal Discomfort 1.7 0.0 3.3 1.7 1.7 3.9
Tachycardia 1.5 1.0 1.3 3.4 0.3 0.5
Rash 1.5 1.5 2.0 1.7 0.3 0.7
Pollakiuria 1.5 2.0 1.3 3.4 0.0 < 1.0
Weakness 1.2 0.0 0.7 0.0 0.0 1.2
Vomiting 1.1 1.0 1.3 0.0 0.3 0.2
Diarrhea 1.1 0.0 2.7 3.4 2.0 1.9
* Initial dose of 2.5 mg b.i.d. followed by maintenance dose of 5.0 mg b.i.d.
Initial dose of 2.5 mg b.i.d. followed by sequential titration to 5.0 mg b.i.d., 7.5 mg b.i.d., and maintenance dose of 10.0 mg b.i.d.
Propranolol, prazosin, hydrochlorothiazide, enalapril, captopril.

Except for headache, which is not clearly drug-related (see previous table), the more frequent adverse reactions listed show little change, or increase slightly, in frequency over time, as shown in the following table:

Incidence Rates for DynaCirc (isradipine) (All Doses) by Week (%)

Week 1 2 3 4 5 6
N 94 906 649 847 432 494
Adverse Reaction            
Headache 6.5 6.1 5.2 5.2 5.8 4.5
Dizziness 1.6 1.9 1.7 2.2 2.3 2.0
Edema 1.2 2.5 3.2 3.2 5.3 5.5
Palpitations 1.2 1.3 1.4 1.9 2.1 1.4
Fatigue 0.4 1.0 1.4 1.2 1.2 1.6
Flushing 1.2 1.3 2.0 1.4 2.1 1.4
Week 7 8 9 10 11 12
N 153 377 261 362 107 105
Adverse Reaction            
Headache 2.0 2.7 1.9 2.8 2.8 3.8
Dizziness 2.0 1.9 2.3 3.9 4.7 3.8
Edema 5.9 5.0 4.6 4.7 3.8 3.8
Palpitations 1.3 0.8 0.8 1.7 1.9 2.9
Fatigue 2.0 2.7 1.5 1.4 0.9 1.9
Flushing 3.3 1.3 1.1 0.8 0.0 0.0

Edema, palpitations, fatigue, and flushing appear to be dose-related, especially at the higher doses of 15-20 mg/day. In open-label, long-term studies of up to two years in duration, the adverse events reported were generally the same as those reported in the short-term controlled trials. The overall frequencies of these adverse events were slightly higher in the long-term than in the controlled studies, but as in the controlled trials most adverse reactions were mild and transient.

The following adverse experiences were reported in 0.5%-1.0% of the isradipine-treated patients in hypertension studies, or are rare. More serious events from this and other data sources, including postmarketing exposure, are shown in italics. The relationship of these adverse events to isradipine administration is uncertain.

Skin: pruritus, urticaria

Musculoskeletal: cramps of legs/feet

Respiratory: cough

Cardiovascular: shortness of breath, hypotension, atrial fibrillation, ventricular fibrillation, myocardial infarction, heart failure

Gastrointestinal: abdominal discomfort, constipation, diarrhea

Urogenital: nocturia

Nervous System: drowsiness, insomnia, lethargy, nervousness, impotence, decreased libido, depression, syncope, paresthesia (which includes numbness and tingling), transient ischemicattack, stroke

Autonomic: hyperhidrosis, visual disturbance, dry mouth, numbness

Miscellaneous: throat discomfort, leukopenia, elevated liver function tests

Read the entire FDA prescribing information for Dynacirc (Isradipine)

Dynacirc - User Reviews

Dynacirc User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Dynacirc sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


Get tips on handling your hypertension.