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Homatropine
Pronunciation
U.S. Brand Names
Generic Available
Synonyms
Pharmacological Index
Use
Pregnancy Risk Factor
Contraindications
Warnings/Precautions
Adverse Reactions
Overdosage/Toxicology
Stability
Mechanism of Action
Pharmacodynamics/Kinetics
Usual Dosage
Administration
Mental Health: Effects on Mental Status
Mental Health: Effects on Psychiatric Treatment
Dental Health: Local Anesthetic/Vasoconstrictor Precautions
Dental Health: Effects on Dental Treatment
Patient Information
Nursing Implications
Dosage Forms
References

Pronunciation
(hoe MA troe peen)

U.S. Brand Names
AK-Homatropine® Ophthalmic; Isopto® Homatropine Ophthalmic

Generic Available

Yes


Synonyms
Homatropine Hydrobromide

Pharmacological Index

Anticholinergic Agent, Ophthalmic; Ophthalmic Agent, Mydriatic


Use

Producing cycloplegia and mydriasis for refraction; treatment of acute inflammatory conditions of the uveal tract


Pregnancy Risk Factor

C


Contraindications

Narrow-angle glaucoma, acute hemorrhage or hypersensitivity to the drug or any component in the formulation


Warnings/Precautions

Use with caution in patients with hypertension, cardiac disease, or increased intraocular pressure; safety and efficacy not established in infants and young children, therefore, use with extreme caution due to susceptibility of systemic effects; use with caution in obstructive uropathy, paralytic ileus, ulcerative colitis, unstable cardiovascular status in acute hemorrhage


Adverse Reactions

>10%: Ocular: Blurred vision, photophobia

1% to 10%:

Local: Stinging, local irritation

Ocular: Increased intraocular pressure

Respiratory: Congestion

<1%: Vascular congestion, edema, drowsiness, exudate, eczematoid dermatitis, follicular conjunctivitis


Overdosage/Toxicology

Symptoms of overdose include blurred vision, urinary retention, tachycardia

Anticholinergic toxicity is caused by strong binding of the drug to cholinergic receptors. For anticholinergic overdose with severe life-threatening symptoms, physostigmine 1-2 mg (0.5 mg or 0.02 mg/kg for children) S.C. or I.V., slowly may be given to reverse these effects.


Stability

Protect from light


Mechanism of Action

Blocks response of iris sphincter muscle and the accommodative muscle of the ciliary body to cholinergic stimulation resulting in dilation and loss of accommodation


Pharmacodynamics/Kinetics

Onset of accommodation and pupil effect: Ophthalmic:

Maximum mydriatic effect: Within 10-30 minutes

Maximum cycloplegic effect: Within 30-90 minutes

Duration:

Mydriasis: 6 hours to 4 days

Cycloplegia: 10-48 hours


Usual Dosage

Children:

Mydriasis and cycloplegia for refraction: Instill 1 drop of 2% solution immediately before the procedure; repeat at 10-minute intervals as needed

Uveitis: Instill 1 drop of 2% solution 2-3 times/day

Adults:

Mydriasis and cycloplegia for refraction: Instill 1-2 drops of 2% solution or 1 drop of 5% solution before the procedure; repeat at 5- to 10-minute intervals as needed; maximum of 3 doses for refraction

Uveitis: Instill 1-2 drops of 2% or 5% 2-3 times/day up to every 3-4 hours as needed


Administration

Ophthalmic instillation: Finger pressure should be applied to lacrimal sac for 1-2 minutes after instillation to decrease risk of absorption and systemic reactions


Mental Health: Effects on Mental Status

May cause drowsiness


Mental Health: Effects on Psychiatric Treatment

None reported


Dental Health: Local Anesthetic/Vasoconstrictor Precautions

No information available to require special precautions


Dental Health: Effects on Dental Treatment

No effects or complications reported


Patient Information

May cause blurred vision; if irritation persists or increases, discontinue use


Nursing Implications

Finger pressure should be applied to lacrimal sac for 1-2 minutes after instillation to decrease risk of absorption and systemic reactions


Dosage Forms

Solution, ophthalmic, as hydrobromide:

AK-Homatropine®: 5% (15 mL)

Isopto® Homatropine 2% (5 mL, 15 mL); 5% (5 mL, 15 mL)


References

Barker DB and Solomon DA, "The Potential for Mental Status Changes Associated With Systemic Absorption of Anticholinergic Ophthalmic Medications: Concerns in the Elderly," DICP Ann Pharmacother, 1990, 24(9):847-50.


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