Drug interactions
Demeclocycline + Penicillin g
Severity: Moderate
Demeclocycline and Penicillin g: 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
Bacteriostatic tetracyclines can in theory blunt the activity of bactericidal beta-lactams that depend on cell growth. Clinical evidence is limited and mostly from older studies in serious infections such as meningitis.
What this interaction means in plain words
Demeclocycline and Penicillin g 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
Bacteriostatic inhibition of protein synthesis by demeclocycline may reduce the bactericidal action of penicillin on actively dividing bacteria.
What to do
Avoid combining them for serious infections such as meningitis or endocarditis, and choose a single bactericidal regimen where possible.
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 Demeclocycline with Penicillin g?
MediHelp rates the interaction as moderate. Demeclocycline and Penicillin g 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. Bacteriostatic tetracyclines can in theory blunt the activity of bactericidal beta-lactams that depend on cell growth. Clinical evidence is limited and mostly from older studies in serious infections such as meningitis.
How serious is the interaction between Demeclocycline and Penicillin g?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining them for serious infections such as meningitis or endocarditis, and choose a single bactericidal regimen where possible.
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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