ExoticRx · exoticrx.com/drugs/tropicamide
US brand names:Mydriacyl
Tropicamide is dosed at 1 drop/eye TOPICAL Single application in dogs, per BSAVA Small Animal Formulary, 10th ed. (2020), Part A - Canine and Feline, printed p.420 (corpus PDF p.436), Tropicamide, DOSES - "Dogs, Cats: 1 drop per eye, repeat after 20-30 min if necessary." Formulary of record retained: Plumb's Veterinary Drug Handbook (9th ed. cited; 10th ed. 2023 held), Tropicamide Ophthalmic, Dosages, printed p.1410 (corpus PDF p.1437) - "Mydriasis (extra-label): 1 to 2 drops repeated in 5 minutes in the eye to be examined to achieve pupillary dilation." — Plumb's 10th ed (held) printed p.1410, Tropicamide Ophthalmic monograph; page located 2026-08-05 from the book's own running heads, verified to name the drug in its body text. — EDITION NOTE 2026-08-06: this rule's Plumb's reference names the 9th edition, which is not held and was never consulted. The held copy is the 10th ed (2023). The Plumb's line was never confirmed against the held edition, so rely on it only as background; any other source named in this citation is unaffected. — SOURCE EDITION: BSAVA Small Animal Formulary, Part A — Canine and Feline — ISBN 9781910443705, https://openlibrary.org/isbn/9781910443705; Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207. Verify against current literature before clinical use.
Short-acting muscarinic antagonist that blocks the sphincter pupillae muscle, causing mydriasis. Also causes cycloplegia (ciliary muscle paralysis).
Short duration (4-8 hours). Used for diagnostic fundoscopy. May increase IOP — CONTRAINDICATED in glaucoma. Not for therapeutic mydriasis (use atropine for that). Rapid onset (15-20 min).
Species references:All Cat (Domestic) drugsAll Dog (Domestic) drugs
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A dog/cat sample is shown here. Cited dosing for all 2 species — reptiles, birds, pocket pets, livestock, and equine — is free on the per-species pages above. Pro adds the weight-based calculator for every species.
| Species | Route | Dose | Frequency | Evidence | Source |
|---|---|---|---|---|---|
| Dog (Domestic) | TOPICAL | 1 drop/eye | Single application | Weak | BSAVA Small Animal Formulary, 10th ed. (2020), Part A - Canine and Feline, printed p.420 (corpus PDF p.436), Tropicamide, DOSES - "Dogs, Cats: 1 drop per eye, repeat after 20-30 min if necessary." Formulary of record retained: Plumb's Veterinary Drug Handbook (9th ed. cited; 10th ed. 2023 held), Tropicamide Ophthalmic, Dosages, printed p.1410 (corpus PDF p.1437) - "Mydriasis (extra-label): 1 to 2 drops repeated in 5 minutes in the eye to be examined to achieve pupillary dilation." — Plumb's 10th ed (held) printed p.1410, Tropicamide Ophthalmic monograph; page located 2026-08-05 from the book's own running heads, verified to name the drug in its body text. — EDITION NOTE 2026-08-06: this rule's Plumb's reference names the 9th edition, which is not held and was never consulted. The held copy is the 10th ed (2023). The Plumb's line was never confirmed against the held edition, so rely on it only as background; any other source named in this citation is unaffected. — SOURCE EDITION: BSAVA Small Animal Formulary, Part A — Canine and Feline — ISBN 9781910443705, https://openlibrary.org/isbn/9781910443705; Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
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View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.
| Cat (Domestic) | TOPICAL | 1 drop/eye | Single application | Weak | BSAVA Small Animal Formulary, 10th ed. (2020), Part A - Canine and Feline, printed p.420 (corpus PDF p.436), Tropicamide, DOSES - "Dogs, Cats: 1 drop per eye, repeat after 20-30 min if necessary." Formulary of record retained: Plumb's Veterinary Drug Handbook (9th ed. cited; 10th ed. 2023 held), Tropicamide Ophthalmic, Dosages, printed p.1410 (corpus PDF p.1437) - "Mydriasis (extra-label): 1 to 2 drops repeated in 5 minutes in the eye to be examined to achieve pupillary dilation." — Plumb's 10th ed (held) printed p.1410, Tropicamide Ophthalmic monograph; page located 2026-08-05 from the book's own running heads, verified to name the drug in its body text. — EDITION NOTE 2026-08-06: this rule's Plumb's reference names the 9th edition, which is not held and was never consulted. The held copy is the 10th ed (2023). The Plumb's line was never confirmed against the held edition, so rely on it only as background; any other source named in this citation is unaffected. — SOURCE EDITION: BSAVA Small Animal Formulary, Part A — Canine and Feline — ISBN 9781910443705, https://openlibrary.org/isbn/9781910443705; Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |