What kind of interaction is it?

Timing-sensitive: the two substances can be taken on the same day but should be separated by a minimum time window.

Is this interaction backed by published research?

Yes. NutriStack lists 2 citation rows for the Calcium + Dicloxacillin pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Prescription·timing-sensitive·Moderate evidence

Calcium + Dicloxacillin

Q: Can I take Calcium and Dicloxacillin together?

Yes, if you separate them in time. Calcium and Dicloxacillin have a documented timing-sensitive interaction. Calcium supplements and calcium-rich products can bind oral penicillins in the gastrointestinal tract and, together with food, reduce dicloxacillin absorption. Dicloxacillin is already best absorbed on an empty stomach, and concurrent calcium adds a further chelation/dilution effect that can blunt serum levels.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored timing-sensitive row.

Timing Sensitive Moderate evidence

Calcium supplements and calcium-rich products can bind oral penicillins in the gastrointestinal tract and, together with food, reduce dicloxacillin absorption. Dicloxacillin is already best absorbed on an empty stomach, and concurrent calcium adds a further chelation/dilution effect that can blunt serum levels.

Supplement × Prescription

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

Calcium and Dicloxacillin

Pair type

Timing Sensitive

Evidence

Moderate

Source citations

Scope

Supplement × Prescription

Last verified

June 4, 2026

Timing SensitiveModerate evidence

What is happening. Calcium supplements and calcium-rich products can bind oral penicillins in the gastrointestinal tract and, together with food, reduce dicloxacillin absorption. Dicloxacillin is already best absorbed on an empty stomach, and concurrent calcium adds a further chelation/dilution effect that can blunt serum levels.

Mechanism. Divalent calcium cations complex with the beta-lactam and, with food, slow gastric emptying and lower the bioavailable antibiotic fraction.

Recommendation. Take dicloxacillin on an empty stomach and separate calcium supplements (and antacids) by at least 2 hours. Maintain a consistent schedule for the full antibiotic course.

Timing

Timing & separation.

Space the doses apart by at least this window to avoid the conflict.

Minimum separation

120

Stack Score

How it moves the number.

Effect on the composite score

If both Calcium and Dicloxacillin are in the same stack, this pair applies −5 to your Stack Score (per scored timing-sensitive row).

The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Doluisio JT, et al. Influence of formulation and food on the bioavailability of dicloxacillin. J Pharm Sci. 1969.Needs sourceNo link
2McCarthy CG, Finland M. Absorption and excretion of cloxacillin and dicloxacillin. N Engl J Med. 1960.Needs sourceNo link

Check your full routine

One pair was the worked example.

Drop your supplements and prescriptions into NutriStack and it runs every pair at once: every interaction, synergy, timing rule, and contraindication, each linked to its primary source.

Open the interaction checker → Browse the research index