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Drug Caution Code - Code G




Code G: Glaucoma

Consult your pharmacist if you have glaucoma.

Code G refers to ophthalmic decongestants and anticholinergics.

Ophthalmic decongestants

Naphazoline
Oxymetazoline
Phenylephrine
Tetrahydrozoline

Anticholinergics

Atropine
Dicyclomine
Gylcopyrrolate
Hyoscyamine
Propantheline
Scopalamine

Antihistamines diphenhydramine, dimenhydrinate and doxylamine are coded G for their anticholinergic activity.

OPHTHALMIC DECONGESTANTS have a sympathomimetic effect which causes mydriasis in high doses. Pupillary dilation can precipitate an attack of narrow angle glaucoma in susceptible persons. Although the incidence of narrow angle glaucoma is relatively low at 5% of glaucoma patients, this is a potentially serious reaction. Undiagnosed or uncontrolled glaucoma patients may suffer damage to the optic nerve.

ANTICHOLINERGICS also cause mydriasis and are contraindicated in narrow angle glaucoma. Those with open angle glaucoma may also have a slight increase in intraocular pressure necessitating an adjustrnent in glaucoma therapy.

Patient Counselling

Refer to an ophthalmologist inunediately if there are symptoms including:
Abnormal pupil size
Pain in the eye
Changes in vision
Excessive discharge
Floating spots
Marked sensitivity to light
Injury to eye
Symptoms lasting longer than 48-72 hours













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