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Drug Interactions between Alphagan and phentolamine

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

phentolamine brimonidine ophthalmic

Applies to: phentolamine and Alphagan (brimonidine ophthalmic)

Consumer information for this interaction is not currently available.

MONITOR: Topically administered alpha-2 adrenergic receptor agonists such as apraclonidine and brimonidine are systemically absorbed, with the potential for producing rare but clinically significant systemic effects such as hypotension and bradycardia. The possibility for an additive or potentiating effect on blood pressure and heart rate should be considered when used with other medications that affect these parameters, such as ophthalmic and systemic beta blockers, vasodilators, cardiac glycosides, and antihypertensive agents.

MANAGEMENT: Blood pressure and pulse rate should be monitored regularly when topical alpha-2 adrenergic receptor agonists are prescribed in combination with cardiovascular drugs. Patients should be advised to notify their physician if they experience slow pulse, irregular heartbeat, dizziness, lightheadedness, or syncope.

References

  1. King MH, Richards DW "Near syncope and chest tightness after administration of apraclonidine before argon laser iridotomy." Am J Ophthalmol 110 (1990): 308-9
  2. "Product Information. Iopidine (apraclonidine ophthalmic)." Alcon Laboratories Inc PROD
  3. Nordlund JR, Pasquale LR, Robin AL, Rudikoff MT, Ordman J, Chen KS, Walt J "The cardiovascular, pulmonary, and ocular hypotensive effects of 0.2% brimonidine." Arch Ophthalmol 113 (1995): 77-83
  4. "Product Information. Alphagan (brimonidine ophthalmic)." Allergan Inc PROD (2001):
  5. Walters TR "Development and use of brimonidine in treating acute and chronic elevations of intraocular pressure: a review of safety, efficacy, dose response, and dosing studies." Surv Ophthalmol 41 ( Suppl (1996): s19-26
  6. Pekdemir M, Yanturali S, Karakus G "More than just an ocular solution." Emerg Med J 22 (2005): 753-4
  7. "Product Information. Mirvaso (brimonidine topical)." Galderma Laboratories Inc (2013):
View all 7 references

Drug and food interactions

Moderate

phentolamine food

Applies to: phentolamine

Phentolamine and ethanol may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate. These side effects are most likely to be seen at the beginning of treatment, following a dose increase, or when treatment is restarted after an interruption. Let your doctor know if you develop these symptoms and they do not go away after a few days or they become troublesome. Avoid driving or operating hazardous machinery until you know how the medications affect you, and use caution when getting up from a sitting or lying position. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

See also

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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