Drug interactions
Methyclothiazide + Penicillin g
Severity: Minor
Methyclothiazide and Penicillin g: minor 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
Thiazide diuretics may slightly reduce renal tubular secretion of penicillins, which could raise penicillin G concentrations. The effect is small and rarely matters clinically because penicillin G has a wide safety margin.
What this interaction means in plain words
Methyclothiazide and Penicillin g have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Possible competition for renal tubular organic anion secretion, reducing penicillin G clearance.
What to do
No action is usually required. Consider monitoring for penicillin toxicity, such as neurotoxicity, if high doses are used in a patient with renal impairment.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Methyclothiazide and Penicillin g, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Penicillin g
- Amifampridine + Penicillin g Moderate
- Amiloride + Penicillin g Moderate
- Bcg vaccine live + Penicillin g Moderate
- Cholera vaccine + Penicillin g Moderate
- Colestipol + Penicillin g Moderate
- Deflazacort + Penicillin g Moderate
Frequently asked questions
Can I take Methyclothiazide with Penicillin g?
MediHelp rates the interaction as minor. Methyclothiazide and Penicillin g have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Thiazide diuretics may slightly reduce renal tubular secretion of penicillins, which could raise penicillin G concentrations. The effect is small and rarely matters clinically because penicillin G has a wide safety margin.
How serious is the interaction between Methyclothiazide and Penicillin g?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No action is usually required. Consider monitoring for penicillin toxicity, such as neurotoxicity, if high doses are used in a patient with renal impairment.
What other medicines interact with Penicillin g?
MediHelp also lists interactions of Penicillin g with, for example, Amifampridine, Amiloride, Bcg vaccine live. The full list is on the Penicillin g page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
