Can I use Monit GTN 2.6 mg patch and Timzid (timolol) 80 µg eye drops once daily together?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: September 13, 2026 • View editorial policy

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

Ask Question

Can You Take Monit GTN 2.6 mg and Timzid 80 µg Together?

Yes, you can safely use Monit GTN 2.6 mg (glyceryl trinitrate patch) and Timzid 80 µg (timolol eye drops) together—there are no contraindications to concurrent use of these medications.

Why This Combination is Safe

These medications work on completely different systems with minimal interaction potential:

  • Monit GTN (glyceryl trinitrate) is a systemic nitrate vasodilator used for angina or hypertension, absorbed through the skin
  • Timzid (timolol eye drops) is a topical beta-blocker used primarily for glaucoma or ocular hypertension, with minimal systemic absorption when used as directed

Key Clinical Considerations

Systemic Absorption from Eye Drops

While timolol eye drops are applied topically, some systemic absorption does occur 1. This can potentially cause:

  • Bradycardia (slow heart rate)
  • Hypotension (low blood pressure)
  • Bronchospasm in susceptible individuals
  • Masking of hypoglycemia symptoms in diabetics 2

Additive Blood Pressure Effects

Both medications can lower blood pressure:

  • GTN patches cause vasodilation and reduce blood pressure systemically
  • Timolol eye drops, even at low ophthalmic doses, may have mild systemic beta-blocking effects that can lower blood pressure and heart rate 3, 4

Monitor for excessive hypotension or bradycardia, especially when first starting this combination or adjusting doses.

Practical Management Points

If you have cardiac disease (especially angina):

  • The combination is actually commonly used—beta-blockers and nitrates are both standard treatments for chronic stable angina 5
  • Beta-blockers can help prevent nitrate-induced reflex tachycardia
  • This is a therapeutically rational combination 6, 5

If you have glaucoma requiring timolol:

  • Continue your eye drops as prescribed
  • The GTN patch will not interfere with the intraocular pressure-lowering effects 7, 8
  • Timolol eye drops are highly effective for glaucoma with once or twice daily dosing 9, 4

Watch for these warning signs:

  • Dizziness or lightheadedness (especially when standing)
  • Heart rate below 50-55 beats per minute
  • Excessive fatigue
  • Shortness of breath or wheezing

Special Populations

If you have asthma or COPD: Use timolol eye drops with caution, as even topical beta-blockers can cause bronchospasm 2. Consider discussing alternative glaucoma medications with your ophthalmologist.

If you are elderly: You may be more sensitive to the blood pressure-lowering effects of both medications. Start with close monitoring 10.

Bottom Line

This combination is safe and commonly used in clinical practice. The main precaution is monitoring for additive cardiovascular effects (low blood pressure or slow heart rate), particularly during the first few weeks of concurrent use. If you experience concerning symptoms, contact your healthcare provider promptly.

References

Related Questions

What is the typical length of treatment with brimonidine (alpha-2 adrenergic agonist) eye drops for conditions like glaucoma or ocular hypertension?
What is the recommended dosage and administration of Brimonidine (alpha-2 adrenergic agonist) ophthalmic drops for adults and children with ocular hypertension or glaucoma?
My provider prescribed a Timzid (timolol) 80 µg once‑daily oral capsule instead of the usual eye‑drop formulation; is this prescription correct and safe?
Can dorzolamide-timolol (beta blocker and carbonic anhydrase inhibitor) eye drops be used with brimonidine (alpha-2 adrenergic agonist) eye drops for glaucoma treatment?
How do Duotrav (travoprost 0.004%/timolol 0.5% fixed‑combination), Lumigan (bimatoprost 0.01%), and Timoptic XE (timolol 0.5% gel‑forming) compare regarding indications, dosing, efficacy, and adverse effects for intra‑ocular pressure reduction?
Which of the following is not used in the management of a thyrotoxic crisis? a) 0.9% sodium chloride (NaCl) b) Thiamazole (methimazole) c) Corticosteroids d) Beta‑blockers e) Calcitonin
In a patient with worsening leukocytosis (white blood cell count increasing from 14 to 20 ×10⁹/L), recent piperacillin‑tazobactam (Zosyn) and amoxicillin‑clavulanate (Augmentin) for aspiration pneumonia, Escherichia coli/Proteus urinary tract infection treated with fosfomycin, CT evidence of enteritis, stool collected for Clostridioides difficile, and chronic tube feeding, what is the appropriate infectious disease management?
What is the brand name of lubiprostone?
What are the definition, clinical presentation, diagnosis, and therapy of thyrotoxic crisis?
If a hepatitis A or hepatitis B vaccine dose is administered outside the ACIP-recommended interval, does it need to be repeated?
Does allopurinol affect renal function?

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.