darifenacin vs solifenacin
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of darifenacin and solifenacin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Enablex
Vesicare
Darifenacin (Enablex) is a medicine that helps control an overactive bladder. It reduces the feeling of needing to go to the bathroom so often.
Solifenacin (Vesicare) is a medicine that helps control an overactive bladder. It reduces the feeling of needing to go to the bathroom so often.
This medicine treats overactive bladder. If you have overactive bladder, you may feel a sudden need to urinate. You may also urinate more often than normal, or leak urine.
This medicine treats overactive bladder in adults. It helps with symptoms like needing to urinate urgently, frequent urination, and leaking urine. It works to reduce these urges and help you control your bladder.
Darifenacin blocks certain receptors in the bladder. These receptors cause the bladder muscles to contract. By blocking them, the medicine helps the bladder relax and hold more urine.
Solifenacin blocks certain receptors in the bladder called muscarinic receptors. By blocking these receptors, the bladder muscle relaxes. This helps to reduce the urge to urinate frequently and reduces leakage.
- • Dry mouth
- • Constipation
- • Headache
- • Upset stomach
- • Nausea
- • Dry mouth
- • Constipation
- • Urinary tract infection
- • Blurred vision
- Peripheral Swelling 91
- Herpes Zoster 83
- Pneumonia Viral 79
- Anaemia 59
- Arthralgia 59
- Dry mouth 1,616
- Constipation 1,613
- Tiredness 1,275
- Fall 1,226
- Dizziness 1,032
If you have bladder problems that cause you to have trouble urinating, use darifenacin with caution because it could make it harder to urinate. Use caution if you have stomach or bowel blockage, as this medicine can make it worse. Darifenacin may cause sleepiness, so do not drive or operate heavy machinery until you know how it affects you. Angioedema (swelling of the face, lips, tongue, and/or throat) has been reported with darifenacin and can be life-threatening.
This medicine may cause swelling of the face, lips, tongue, or throat. If this happens, stop taking solifenacin and get medical help right away. This medicine is not recommended if you have a bladder problem that makes it hard to empty your bladder. It is also not recommended if you have slow movement in your stomach or intestines. This medicine may cause sleepiness, so be careful driving or operating heavy machinery until you know how it affects you.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if darifenacin will harm your unborn baby. Talk to your doctor if you are breastfeeding or plan to breastfeed, as it is not known if darifenacin passes into breast milk.
Tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. It is not known if solifenacin can harm your unborn baby. It is also not known if solifenacin passes into breast milk.
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How to Read This darifenacin vs solifenacin Comparison
darifenacin is classified in the Anticholinergic (Overactive Bladder) drug class, while solifenacin sits within the Anticholinergic (Overactive Bladder) class. Because both drugs share the same classification, they are often considered interchangeable in theory, but clinical outcomes rarely track that cleanly. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, darifenacin has 371 submissions while solifenacin has 6,762. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for darifenacin or solifenacin.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.