[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Pharmacology](https://durgical.com/en/pharmacology/) › [Mydriatics and cycloplegics](https://durgical.com/en/pharmacology/classes/mydriatics-and-cycloplegics/) › Tropicamide

# Tropicamide

## Mydriatics and cycloplegics?

Mydriatics and cycloplegics

A short-acting antimuscarinic eye drop that widens the pupil for eye examinations. The effect wears off within the day.

Updated Nov 1, 2026

## Quick facts

**Group**
[Mydriatics and cycloplegics](https://durgical.com/en/pharmacology/classes/mydriatics-and-cycloplegics/)

**Target**
Muscarinic acetylcholine receptors of the iris sphincter and ciliary muscle

**Used for**
Pupil dilation for examination

**Key effects**
Brief stinging · Blurred vision and light sensitivity

**Monitor**
Behaviour · Eye pain

**ATC**
S01FA06

No doses: the clinician sets them by the current guideline.

On this page

- The basics Mechanism of action
- Indications
- Adverse effects
- Pharmacokinetics
- Memory aid

- Safety Contraindications
- Key interactions
- What is monitored
- Administration and safety
- Pregnancy and breastfeeding
- Nursing care

- Study Test yourself

- Connections Connections

## Mechanism of action

Tropicamide blocks muscarinic receptors, so acetylcholine can no longer contract the iris sphincter (the pupil widens: mydriasis) or the ciliary muscle (focusing is paralysed: cycloplegia). Its cycloplegia is weaker and shorter than that of cyclopentolate or atropine, which makes it the usual drop for a dilated fundus examination.

- Tropicamide blocks muscarinic receptors in the eye
- The iris sphincter relaxes: the pupil widens
- The ciliary muscle relaxes: near focus is lost for a while

## Indications

- Pupil dilation for examination of the retina, for example diabetic retinopathy screening [Diabetic retinopathy →](https://durgical.com/en/conditions/diabetic-retinopathy/)
- Cycloplegia for diagnostic procedures

## Adverse effects

### Common

- Brief stinging
- Blurred vision and light sensitivity
- Superficial punctate keratitis
- Dry mouth, fast heart rate, headache

### Serious (rare, important)

- Rise in intraocular pressure
- Central nervous system disturbances, dangerous in children
- Psychotic reactions, behaviour changes and cardiorespiratory collapse in children

## Contraindications

- Hypersensitivity to any component
- Not for injection

## Key interactions

**Carbachol, pilocarpine or ophthalmic cholinesterase inhibitors**
Tropicamide can counteract their pressure-lowering effect

## What is monitored

- Behaviour, heart rate and breathing in children after the drops
- Eye pain, halos or a red eye after dilation (raised pressure)

## Administration and safety

- Pressure on the lacrimal sac after the drop reduces systemic absorption.
- Contact lenses come out before the drops.
- The dropper tip must not touch any surface.

## Pregnancy and breastfeeding

No animal reproduction studies exist; it is used in pregnancy only if clearly needed.

## Nursing care

- Warn that vision will be blurred and light will be uncomfortable for several hours; the patient should not drive while dilated.
- Suggest sunglasses to protect the eyes from bright light.
- Watch children for agitation, confusion, flushing or a fast pulse.
- Ask the patient to report eye pain or halos after the exam.

## Pharmacokinetics

**Onset and duration**
Acts in about 15–30 minutes and lasts about 3–8 hours; full recovery can take up to 24 hours; dark irides may need more drops

## Memory aid

TROPICAmide is a short «tropical holiday» for the pupil: wide open in a quarter of an hour, home again within the day.

## Test yourself

Think of the answer, then tap the question to see it.

## Why does tropicamide dilate the pupil?

It blocks muscarinic receptors, so the iris sphincter relaxes.

## Why is tropicamide preferred over atropine for a routine fundus examination?

Its effect is short (hours, not days) and its cycloplegia is weaker.

## Which patients are most at risk of central nervous system effects from mydriatic drops?

Children.

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[More Pharmacology questions →](https://durgical.com/en/practice/?f=pharmacology)

## Connections

## Related drugs 3

- [Cyclopentolate](https://durgical.com/en/pharmacology/cyclopentolate/)
- [Atropine](https://durgical.com/en/pharmacology/atropine/)
- [Phenylephrine](https://durgical.com/en/pharmacology/phenylephrine/)

## Related conditions 1

- [Diabetic retinopathy](https://durgical.com/en/conditions/diabetic-retinopathy/)

[← Back to the class: Mydriatics and cycloplegics](https://durgical.com/en/pharmacology/classes/mydriatics-and-cycloplegics/)

Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: [DailyMed - TROPICAMIDE solution/ drops](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=0104ffe4-013d-4afa-996d-dcba4f08e93d) (DailyMed (U.S. National Library of Medicine), 2026); [ATCDDD - ATC/DDD Index](https://atcddd.fhi.no/atc_ddd_index/?code=S01FA06) (WHO Collaborating Centre for Drug Statistics Methodology, 2026).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/pharmacology/tropicamide/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/pharmacology/tropicamide/