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.". 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
Each ExoticRx dose rule is graded by the strength of its primary evidence — see the editorial process.
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 | Strong | 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." |
| Cat (Domestic) | TOPICAL | 1 drop/eye | Single application | Strong | 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." |
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View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.