Drug interactions
Methazolamide + Topiramate
Severity: Moderate
Methazolamide and Topiramate: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs inhibit carbonic anhydrase, so together they raise the risk of metabolic acidosis and of kidney stone formation. Urine becomes more alkaline with lower citrate, favouring calcium phosphate stones.
What this interaction means in plain words
Methazolamide and Topiramate can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive carbonic anhydrase inhibition causing bicarbonate loss, alkaline urine and hypocitraturia.
What to do
Monitor serum bicarbonate at baseline and periodically, and encourage adequate hydration. Reduce the dose or stop one agent if persistent acidosis or stones develop.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Topiramate
Frequently asked questions
Can I take Methazolamide with Topiramate?
MediHelp rates the interaction as moderate. Methazolamide and Topiramate can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs inhibit carbonic anhydrase, so together they raise the risk of metabolic acidosis and of kidney stone formation. Urine becomes more alkaline with lower citrate, favouring calcium phosphate stones.
How serious is the interaction between Methazolamide and Topiramate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum bicarbonate at baseline and periodically, and encourage adequate hydration. Reduce the dose or stop one agent if persistent acidosis or stones develop.
What other medicines interact with Topiramate?
MediHelp also lists interactions of Topiramate with, for example, Benzhydrocodone / acetaminophen, Buprenorphine long-acting, Buprenorphine subdermal implant. The full list is on the Topiramate page.
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