TROPICACYL
Clinical safety rating: caution
Comprehensive clinical and safety monograph for TROPICACYL (TROPICACYL).
Tropicacyl contains tropicamide, a synthetic anticholinergic agent that blocks muscarinic acetylcholine receptors (M1, M2, M3 subtypes) in the iris sphincter muscle and ciliary muscle, producing mydriasis (pupil dilation) and cycloplegia (paralysis of accommodation).
| Metabolism | Primarily metabolized by ester hydrolysis in plasma and liver; minor hepatic metabolism via CYP450 enzymes (CYP3A4 and CYP2D6). |
| Excretion | Renal: 60-80% (as unchanged drug and metabolites); fecal: 20-40% via biliary elimination |
| Half-life | Terminal half-life: 1.5-5 hours (clinically, ocular effects diminish rapidly within 4-6 hours due to redistribution) |
| Protein binding | Approximately 10-20% bound to plasma proteins (albumin) |
| Volume of Distribution | 0.6-1.2 L/kg; indicates distribution beyond plasma into total body water, with higher concentrations in ocular tissues |
| Bioavailability | Topical ophthalmic: approximately 1-2% due to limited corneal penetration and systemic absorption; oral/IV: not applicable for clinical use |
| Onset of Action | Topical ophthalmic: 15-30 minutes for cycloplegia; 5-10 minutes for mydriasis |
| Duration of Action | Cycloplegia: 2-6 hours; mydriasis: 4-8 hours; residual effects may last up to 24 hours in some patients |
1 to 2 drops of 0.5% or 1% solution to the eye(s) 15-20 minutes before examination; may repeat in 30 minutes if needed.
| Dosage form | SOLUTION/DROPS |
| Renal impairment | No clinically significant renal elimination; dose adjustment not required. |
| Liver impairment | No specific guidelines; use with caution in severe hepatic impairment due to potential systemic effects. |
| Pediatric use | Infants and children: 1 drop of 0.5% solution to each eye 15-20 minutes before examination; may repeat with 0.5% solution once after 15-20 minutes if needed. Max total dose: 1.5 mg per eye. |
| Geriatric use | Geriatric patients may be more susceptible to systemic anticholinergic effects; use lowest effective dose and monitor for adverse reactions. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for TROPICACYL (TROPICACYL).
| Breastfeeding | It is not known if tropicamide is excreted in breast milk. M/P ratio not available. Due to potential for systemic absorption and anticholinergic effects, caution is advised. Use only if benefit outweighs risk. |
| Teratogenic Risk | Tropicacyl (tropicamide) is an anticholinergic agent. No well-controlled studies in pregnant women. Adequate animal reproduction studies have not been conducted. Risk cannot be ruled out. Use only if clearly needed. First trimester: Potential for anticholinergic effects; avoid if possible. Second and third trimesters: Limited data; no known teratogenicity reported. |
■ FDA Black Box Warning
None
| Common Effects | Stinging in the eyes Blurred vision Dryness in mouth |
| Serious Effects |
["Hypersensitivity to tropicamide or any component of the formulation","Narrow-angle glaucoma or anatomically narrow angles","Concurrent use with other anticholinergics may increase systemic effects"]
| Precautions | ["Risk of increased intraocular pressure in patients with narrow-angle glaucoma","Systemic anticholinergic effects (tachycardia, dry mouth, blurred vision) especially in children and elderly","Photosensitivity due to prolonged mydriasis; advise sun protection","May cause confusion or exacerbation of psychosis in susceptible patients"] |
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| Fetal Monitoring | Monitor for maternal systemic anticholinergic effects (tachycardia, dry mouth, blurred vision, urinary retention) and fetal heart rate changes if systemic absorption occurs. No specific fetal monitoring required with ophthalmic use. |
| Fertility Effects | No known effects on fertility from ophthalmic use. Systemic anticholinergic effects could theoretically impact fertility, but with ocular administration, systemic levels are low. |