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Calan Side Effects Center
Medically reviewed by Min Clinic Staff | Updated: January 2026
- Generic Name: verapamil hcl
- Brand Name: Calan
- Drug Class: Antidysrhythmics, IV
Calan (Verapamil HCl) side effects drug center
Calan Side Effects Center
What Is Calan?
Calan (verapamil hydrochloride) is a calcium channel blocker used to treat hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders. Calan is available in generic form.
What Are Side Effects of Calan?
Common side effects of Calan include:
- dizziness,
- slow heartbeat,
- constipation,
- nausea,
- headache,
- tiredness,
- skin rash or itching, or
- flushing (warmth, itching, redness, or tingly feeling under your skin).
Tell your doctor if you have unlikely but serious side effects of Calan including:
- swelling ankles or feet,
- shortness of breath,
- unusual tiredness,
- unexplained or sudden weight gain,
- severe dizziness,
- fainting,
- fast or very slow heartbeat,
- fever, sore throat, and headache with a severe blistering, peeling, and red skin rash,
- restless muscle movements in your eyes, tongue, jaw, or neck,
- stomach pain,