What the label lists and what reports show
Verapamil side effects
Verapamil's FDA label lists its adverse reactions in its own words. FAERS holds 4,242 reports naming it through July 30, 2026; the reaction reported most often, leaving out the conditions it is used for, product-use terms and outcomes, is dyspnoea (353 reports).
- Generic listed
- A presentation discontinued
Check it at the source: the verapamil FDA label on DailyMed (effective April 6, 2026, Zydus Pharmaceuticals (USA) Inc.); the FDA FAERS public dashboard.
What does the label list?
From the label: adverse reactionsSerious adverse reactions are uncommon when verapamil therapy is initiated with upward dose titration within the recommended single and total daily dose. See WARNINGS for discussion of heart failure, hypotension, elevated liver enzymes, AV block, and rapid ventricular response. Reversible (upon discontinuation of verapamil) non-obstructive, paralytic ileus has been infrequently reported in association with the use of verapamil. The following reactions to orally administered verapamil occurred at rates greater than 1% or occurred at lower rates but appeared clearly drug-related in clinical trials in 4,954 patients: Constipation 7.3% Dyspnea 1.4% Dizziness 3.3% Bradycardia (HR <50/min) 1.4% Nausea 2.7% Hypotension 2.5% AV block (total 1°, 2°, 3°) (2° and 3°) 1.2% 0.8% Headache 2.2% Edema 1.9% CHF, Pulmonary edema 1.8% Rash 1.2% Fatigue 1.7% Flushing 0.6% Elevated liver enzymes (see …
Source: FDA drug label, Zydus Pharmaceuticals (USA) Inc., effective April 6, 2026 (SPL set e19ab8d8-dae5-489d-9805-7e7407bea06d), via openFDA; the full label on DailyMed
What do FAERS reports show?
4,242 reports list verapamil among the medicines taken, each a report of something that happened, not proof the medicine caused it; 948 are coded as a death and 1,922 as a hospital stay. Counts follow how widely a medicine is used and watched, and they are not a measure of how risky it is. Of the 21 reactions below, 9 are named by the same term (in US spelling) in the label's adverse reactions, warnings or patient leaflet; a reaction the label does not name may still be there under another word, and a report does not show that the medicine caused it.
Reports received each year
The 25 most reported reactions
Source: FDA Adverse Event Reporting System (FAERS) via openFDA, reports through July 30, 2026; reactions as MedDRA preferred terms
What next?
- Verapamil: the full record
- label, generics, price, shortages, recalls
- Report a side effect to the FDA
- MedWatch
- Side effects hub
- the most reported medicines and reactions