Flavoxate 200 mg Use
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I now have comprehensive information. Here is a complete clinical overview of Flavoxate 200 mg:
Flavoxate 200 mg - Complete Drug Profile
Drug Class & Category
- Class: Urinary tract antispasmodic / spasmolytic
- Brand name: Urispas
- Type: Synthetic urinary tract smooth muscle relaxant
- Formulation: Flavoxate hydrochloride 100 mg and 200 mg tablets
Mechanism of Action
Flavoxate has a "mixed" mechanism that is not purely antimuscarinic. It works through three main pathways:
- Phosphodiesterase (PDE) inhibition - raises intracellular cAMP, relaxing smooth muscle
- Calcium channel antagonism - moderate calcium antagonistic activity reduces smooth muscle contractility
- Local anesthetic effect - direct relaxant effect on urinary tract smooth muscle
It does NOT have a significant antimuscarinic effect, distinguishing it from drugs like oxybutynin. Its main metabolite (3-methylflavone-8-carboxylic acid, MFCA) has low pharmacologic activity.
Pharmacokinetics:
- Oral bioavailability: close to 100%
- Extensively metabolized
- Plasma half-life: ~3.5 hours
Indications (Approved Uses)
Flavoxate 200 mg is indicated for symptomatic relief (not definitive treatment) of lower urinary tract symptoms:
| Symptom | Associated Conditions |
|---|---|
| Dysuria (painful urination) | Cystitis |
| Urinary urgency | Prostatitis |
| Nocturia (nighttime urination) | Urethritis |
| Suprapubic pain | Urethrocystitis |
| Urinary frequency | Urethrotrigonitis |
| Urinary incontinence | Overactive bladder (OAB) |
It is compatible with antibiotics when urinary tract infection is present.
Dosage & Administration
| Population | Dose |
|---|---|
| Adults and adolescents (≥12 years) | 100-200 mg orally, 3-4 times daily (i.e., every 6-8 hours) |
| Children under 12 years | Not recommended (safety and efficacy not established) |
| With improvement | Dose may be reduced |
- Can be taken on an empty stomach or with food/milk if gastric irritation occurs.
- A typical study dose was 200 mg three times daily or up to 1200 mg/day in clinical trials.
Contraindications
Flavoxate is contraindicated in:
- Pyloric or duodenal obstruction
- Obstructive intestinal lesions or ileus
- Achalasia
- Gastrointestinal hemorrhage
- Obstructive uropathy of the lower urinary tract
Adverse Effects
More frequent:
- Dry mouth and throat
- Drowsiness
- Blurred vision / disturbance in eye accommodation
Less frequent / rare:
- Nausea, vomiting, constipation
- Vertigo, headache
- Mental confusion (especially in the elderly)
- Tachycardia and palpitations
- Nervousness
- Increased ocular tension (caution in glaucoma)
- Leukopenia (rare, reversible on stopping the drug)
- Urticaria, eosinophilia, hyperpyrexia (allergic reactions)
Precautions
- Use with caution in glaucoma (may raise intraocular pressure)
- Do not drive or operate machinery if drowsiness or blurred vision occurs
- Elderly patients are at higher risk for confusion
- Pregnancy/Lactation: No well-controlled studies in pregnant women; exercise caution in nursing women as excretion in breast milk is unknown
Clinical Evidence
From Campbell-Walsh-Wein Urology: Studies comparing flavoxate with oxybutynin (1200 mg/day vs. 15 mg/day) in women with urgency showed comparable efficacy but fewer and milder side effects with flavoxate. A meta-analysis of 43 studies (Sweeney et al., 2016) demonstrated flavoxate had better clinical efficacy than placebo with almost no side effects, supporting its use in OAB. However, RCT evidence remains limited compared to newer antimuscarinics.
Note: Flavoxate is not approved in the United States by the FDA for current prescribing, but remains widely used globally, especially in South Asia and Europe.
Sources: - Campbell-Walsh-Wein Urology (3-Vol Set), Antimuscarinics With "Mixed" Action | Medscape Flavoxate Reference | Prescribing Information
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