TM Owner Sandoz Inc.
Timolol GFS 0.50% Ophthalmic Gel-Forming Solution (drops)
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Indications & Clinical Uses
- Timolol GFS 0.5% (timolol maleate ophthalmic gel-forming solution) is the AB-rated generic equivalent of Timoptic-XE, made by Alcon Laboratories for Sandoz Inc.; it is a topical non-selective beta-blocker used to lower elevated pressure inside the eye in adults with ocular hypertension or open-angle glaucoma.
- Unlike a plain aqueous eye drop, the solution thickens into a gel on contact with the tear film, giving sustained drug release from a single drop instilled once daily, so it must be shaken before each use.
- This is a genuinely different formulation from the twice-daily aqueous Timoptic solution and should not be confused with it or dosed the same way.
- Timolol GFS is available in 0.25% and 0.5% strengths and is taken at home by the patient, not administered in a clinic.
Side Effects
- Transient blurred vision lasting 30 seconds to 5 minutes after instillation affects roughly one in three patients, and burning or stinging affects about one in eight; other reported effects include eye irritation, dryness, and headache.
- Timolol GFS has no boxed warning, but as a beta-blocker it can be absorbed into the bloodstream and cause serious effects in susceptible people: slow or irregular heartbeat, worsening breathing difficulty or wheezing in those with asthma or COPD, and worsening of heart failure.
- Seek urgent care for chest pain, severe shortness of breath, or a very slow pulse.
- People with diabetes should know it can mask the early warning signs of low blood sugar.
Precautions & Warnings
- Timolol GFS must not be used by anyone with bronchial asthma or a history of it, severe chronic obstructive pulmonary disease, a slow heart rate (sinus bradycardia), second- or third-degree heart block, overt heart failure, cardiogenic shock, or hypersensitivity to its ingredients.
- Use with caution in diabetes, since it can hide signs of hypoglycaemia, and in hyperthyroidism, since it can mask a fast heartbeat.
- Remove contact lenses before instilling a dose and wait at least 15 minutes before reinserting them.
- Pressing gently on the inner corner of the eye after each drop reduces the amount absorbed into the body.
- Shake the bottle well before each use, since the gel-forming ingredient can settle.
Avoid Interactions
- Tell your healthcare provider and pharmacist about all medicines and supplements you use.
- Taking Timolol GFS with an oral beta-blocker can add to its effects on heart rate and blood pressure, and combining it with certain calcium channel blockers raises the risk of heart conduction problems.
- Catecholamine-depleting drugs such as reserpine can cause an additive drop in blood pressure and slow heart rate, and CYP2D6 inhibitors can increase how much timolol reaches the bloodstream.
- Do not use Timolol GFS together with a second topical beta-blocker eye drop, since this adds no benefit and increases side effects.
References
Frequently Asked Questions
Timolol GFS (timolol maleate gel-forming solution) lowers high pressure inside the eye in adults with ocular hypertension or open-angle glaucoma. It works by reducing fluid production in the eye. It is the generic, once-daily gel version equivalent to the branded product Timoptic-XE.
Shake the bottle, then place one drop of Timolol GFS in the affected eye once daily, usually in the morning. It forms a gel on the eye's surface for steady, all-day pressure control. Do not use it more often than once a day unless told to.
Brief blurred vision after the drop, lasting seconds to a few minutes, affects about one in three people, and burning or stinging affects about one in eight. Less often it slows the heart rate or worsens breathing in people with asthma or COPD.
Avoid Timolol GFS if you have asthma, severe COPD, a slow heart rate, certain heart block, or heart failure. Do not combine it with another beta-blocker eye drop. Tell your doctor about oral beta-blockers and calcium channel blockers, which can add to its effects.
Use the missed drop as soon as you remember that day; if it is almost time for the next dose, skip the missed one and continue as normal. Do not use two doses at once. Missed doses can let eye pressure rise, so try to stay consistent.
No. Timolol GFS is a once-daily gel-forming solution, generically equivalent to Timoptic-XE, while Timoptic is a plain aqueous drop usually given twice daily. Both contain timolol maleate, but they are different formulations - do not switch between them without your doctor's guidance.
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