Medical Editor: John P. Cunha, DO, FACOEP
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.
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:
- warmth, redness, or tingly feeling under your skin;
- 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)
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.
|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‡|
|* 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
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.
Musculoskeletal: cramps of legs/feet
Gastrointestinal: abdominal discomfort, constipation, diarrhea
Miscellaneous: throat discomfort, leukopenia, elevated liver function tests
Read the entire FDA prescribing information for Dynacirc (Isradipine)
© Dynacirc Patient Information is supplied by Cerner Multum, Inc. and Dynacirc Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.