Drug interactions
Penicillin g + Sodium phenylacetate
Severity: Moderate
Penicillin g and Sodium phenylacetate: 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 penicillin G and phenylacetate conjugates are eliminated by renal tubular secretion, so competition may raise levels of either agent. Penicillin has been reported to compete with renal excretion of phenylacetylglutamine and related conjugates, potentially affecting ammonia-lowering efficacy.
What this interaction means in plain words
Penicillin g and Sodium phenylacetate 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
Competition for renal tubular organic anion secretion.
What to do
Monitor plasma ammonia in patients with urea cycle disorders and watch for penicillin or phenylacetate toxicity, such as neurotoxicity.
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 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 Penicillin g with Sodium phenylacetate?
MediHelp rates the interaction as moderate. Penicillin g and Sodium phenylacetate 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 penicillin G and phenylacetate conjugates are eliminated by renal tubular secretion, so competition may raise levels of either agent. Penicillin has been reported to compete with renal excretion of phenylacetylglutamine and related conjugates, potentially affecting ammonia-lowering efficacy.
How serious is the interaction between Penicillin g and Sodium phenylacetate?
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 plasma ammonia in patients with urea cycle disorders and watch for penicillin or phenylacetate toxicity, such as neurotoxicity.
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.
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