Cat · Felis catus · typical adult weight 2.50–7.00 kg
Sulfasalazine is dosed at 10–20 mg/kg PO q12h in cats, per Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.1230 (2026-08-01).. Sulfasalazine is used in cats for Colitis, Inflammatory bowel disease / colitis. Routes documented in cats: PO. A typical adult cat weighs 2.50–7.00 kg. ExoticRx lists 2 cited dose rules for Sulfasalazine in cats, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Azulfidine
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 10–20 mg/kg | q12h | 4-6 weeks | Colitis | Weak | Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.1230 (2026-08-01). |
| PO | 10–20 mg/kg | q12-24h | 2-4 weeks, then reassess | Inflammatory bowel disease / colitis | Moderate | Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.1230 (2026-08-01). |
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These ranges are per kg. Enter your cat's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
Cleaved by colonic bacteria to 5-aminosalicylic acid (mesalamine) and sulfapyridine. 5-ASA acts locally to reduce colonic inflammation.
Used for colitis in dogs. KCS (dry eye) risk — monitor Schirmer tear test. Cats: salicylate sensitivity. Folate supplementation recommended. GI upset.
Species-specific contraindications and adverse-reaction reports for cats may differ from canine / feline reference data — consult the primary citations listed with each rule.
Sulfasalazine dose ranges in cats, with cited source references: PO 10–20 mg/kg q12h; PO 10–20 mg/kg q12-24h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Sulfasalazine in cats: PO.
Cited course lengths for Sulfasalazine in cats include: 4-6 weeks; 2-4 weeks, then reassess. Duration depends on the indication — match it to the specific dose rule in the table above.
Sulfasalazine is indicated in cats for: Colitis, Inflammatory bowel disease / colitis.
These are general warnings for Sulfasalazine across species; consult the cat dosing table above for species-specific guidance. Used for colitis in dogs. KCS (dry eye) risk — monitor Schirmer tear test. Cats: salicylate sensitivity. Folate supplementation recommended. GI upset.
Why a species-specific page? Sulfasalazine pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in cats — 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.