Drug interactions
Benzphetamine + Calcium carbonate
Severity: Minor
Benzphetamine and Calcium carbonate: 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
Calcium carbonate can raise urinary pH, which reduces renal elimination of weakly basic amines such as benzphetamine. This may prolong and intensify its sympathomimetic and stimulant effects.
What this interaction means in plain words
Benzphetamine and Calcium carbonate 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
Urinary alkalinization increases the non-ionized fraction of the basic drug, enhancing tubular reabsorption and lowering renal clearance.
What to do
Monitor for increased heart rate, blood pressure, insomnia or jitteriness if antacids are taken regularly with benzphetamine. Reduce the benzphetamine dose if stimulant effects become excessive.
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?
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Other interactions of Calcium carbonate
Frequently asked questions
Can I take Benzphetamine with Calcium carbonate?
MediHelp rates the interaction as minor. Benzphetamine and Calcium carbonate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Calcium carbonate can raise urinary pH, which reduces renal elimination of weakly basic amines such as benzphetamine. This may prolong and intensify its sympathomimetic and stimulant effects.
How serious is the interaction between Benzphetamine and Calcium carbonate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for increased heart rate, blood pressure, insomnia or jitteriness if antacids are taken regularly with benzphetamine. Reduce the benzphetamine dose if stimulant effects become excessive.
What other medicines interact with Calcium carbonate?
MediHelp also lists interactions of Calcium carbonate with, for example, Acalabrutinib, Alendronate, Amlodipine-hydrochlorothiazide-valsartan. The full list is on the Calcium carbonate page.
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