Dog · Canis lupus familiaris · typical adult weight 2.00–80.00 kg
Methenamine is dosed at 10–20 mg/kg PO q12h in dogs, per Greene CE. Infectious Diseases of the Dog and Cat. Elsevier Health Sciences; 2013. Distributed by John Wiley & Sons, Inc. doi:10.1016/c2014-0-03934-2 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.876 (2026-08-01).. Methenamine is used in dogs for UTI prophylaxis. Routes documented in dogs: PO. A typical adult dog weighs 2.00–80.00 kg. ExoticRx lists 1 cited dose rule for Methenamine in dogs, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Mandelamine, Hiprex
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 10–20 mg/kg | q12h | Long-term prophylaxis | UTI prophylaxis | Weak | Greene CE. Infectious Diseases of the Dog and Cat. Elsevier Health Sciences; 2013. Distributed by John Wiley & Sons, Inc. doi:10.1016/c2014-0-03934-2 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.876 (2026-08-01). |
Need the exact dose for your patient?
These ranges are per kg. Enter your dog's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
Hydrolyzed to formaldehyde in acidic urine (pH < 5.5), which is bactericidal. Requires acidic urine pH for activity.
Ineffective if urine pH > 6.5. May need urinary acidifiers concurrently. GI irritation. Avoid in renal insufficiency. Avoid with sulfonamides (precipitate formation).
Species-specific contraindications and adverse-reaction reports for dogs may differ from canine / feline reference data — consult the primary citations listed with each rule.
Methenamine dose range in dogs, with cited source references: PO 10–20 mg/kg q12h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Methenamine in dogs: PO.
Cited course lengths for Methenamine in dogs include: Long-term prophylaxis. Duration depends on the indication — match it to the specific dose rule in the table above.
Methenamine is indicated in dogs for: UTI prophylaxis.
These are general warnings for Methenamine across species; consult the dog dosing table above for species-specific guidance. Ineffective if urine pH > 6.5. May need urinary acidifiers concurrently. GI irritation. Avoid in renal insufficiency. Avoid with sulfonamides (precipitate formation).
Why a species-specific page? Methenamine pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in dogs — the rules above are the citations specific to this species, not generic recommendations.
Sourced from published veterinary references; awaiting credentialed clinical reviewer. See our editorial process. Reference only — not veterinary advice.