Last update Jan. 20, 2026
Likely Compatibility
Suggestions made at e-lactancia are done by APILAM team of health professionals, and are based on updated scientific publications. It is not intended to replace the relationship you have with your doctor but to compound it. The pharmaceutical industry contraindicates breastfeeding, mistakenly and without scientific reasons, in most of the drug data sheets.
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Flavoxate Hydrochloride in other languages or writings:
Flavoxate Hydrochloride belongs to this group or family:
Main tradenames from several countries containing Flavoxate Hydrochloride in its composition:
| Variable | Value | Unit |
|---|---|---|
| Oral Bioavail. | 100 | % |
| Molecular weight | 428 | daltons |
| Protein Binding | 99.5 | % |
| VD | 0.2 | l/Kg |
| pKa | 7.3 | - |
| Tmax | 1 - 2 | hours |
| T½ | 3.5 - 10 | hours |
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e-lactancia is a resource recommended by Academy of Breastfeeding Medicine - 2012 of United States of America
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Anticholinergic smooth muscle relaxant with antimuscarinic action used to relieve spasticity, inflammation, pain, and incontinence of the urinary tract. Oral administration in 3 doses per day.
At the time of the last update, we found no published data on its excretion in breast milk.
Its pharmacokinetic data (moderately high molecular weight and distribution volume and high percentage of plasma protein binding) (Guay 2003, Bertoli 1976) make it unlikely to pass into breast milk in clinically significant amounts.
The antimuscarinic effect may reduce prolactin production (Masala 1982, De Martino 1980). Once lactation is established, milk production depends more on stimulation and regular emptying of the breast than on prolactin concentration.
Side effects are very rare and occasional use would pose a low risk during breastfeeding.
Monitor milk production and anticholinergic symptoms in the infant: irritability, nausea or constipation.
Until more data on this drug in relation to breastfeeding is published, alternatives with a known pharmacokinetic profile that is safer for breastfeeding (greater protein binding, shorter half-life and lower oral bioavailability) may be preferable, especially during the neonatal period and in cases of prematurity.