Medication·Interactions & depletion·Reviewed June 9, 2026
Calcium Carbonate interactions.
Calcium Carbonate has 6 documented interactions in the NutriStack database. Prolonged use is also associated with lower Iron, Vitamin B12, and Folate. The full interaction list, depletion table, and replacement suggestions are below. None of this is a substitute for your prescriber's advice.
Calcium Carbonate at a glance.
A quick, data-grounded summary. The full tables are below.
Calcium Carbonate has 6 documented interactions in the NutriStack database. Prolonged use is also associated with lower Iron, Vitamin B12, and Folate. The full interaction list, depletion table, and replacement suggestions are below. None of this is a substitute for your prescriber's advice.
Substances that interact with calcium carbonate.
Every supplement and medication in the NutriStack database with a documented interaction with this drug, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Ciprofloxacin | Timing Sensitive | Calcium carbonate, whether taken as an antacid or calcium supplement, binds ciprofloxacin in the gut and reduces its absorption by 30 to 50 percent.... details → |
| Doxycycline | Timing Sensitive | Calcium carbonate, taken as either an antacid or calcium supplement, chelates doxycycline in the gut and reduces its absorption substantially. The... details → |
| Iron | Timing Sensitive | Calcium carbonate can reduce iron absorption when taken at the same time. Human studies show calcium can inhibit both heme and non-heme iron... details → |
| Levofloxacin | Timing Sensitive | Calcium carbonate binds levofloxacin in the gut and reduces its absorption substantially. This applies whether calcium carbonate is taken as an... details → |
| Zinc | Timing Sensitive | Calcium carbonate can reduce zinc absorption when taken with the same meal or supplement dose. In a human absorption study, 600 mg of calcium as... details → |
| Risedronate | Synergy | Dietary calcium intake of around 1000-1200 mg/day is required for risedronate to fully build bone, but the calcium must not be taken at the same... details → |
What calcium carbonate can deplete.
Nutrients this medication is associated with lowering over time, with the mechanism, a suggested replacement where one applies, and the biomarker to monitor. Discuss any replacement with your prescriber first.
| Nutrient | Severity | How it happens | Replace with | Monitor |
|---|---|---|---|---|
| Iron | Mild | Calcium carbonate can reduce non-heme iron absorption by competing during intestinal uptake and by buffering gastric acidity. | Iron Bisglycinate | Ferritin + transferrin saturation |
| Vitamin B12 | Mild | Chronic acid buffering can reduce release of food-bound B12 from dietary proteins. | Methylcobalamin | Serum B12 + methylmalonic acid |
| Folate | Mild | Chronic acid buffering can modestly reduce folate absorption in some users. | Methylfolate | Serum folate or RBC folate |
The full calcium carbonate profile.
Uses, typical dosing, side effects, and the cited evidence for this medication.
Common calcium carbonate questions.
Quick answers drawn from the tables above.
What interacts with Calcium Carbonate?
In the NutriStack database, Calcium Carbonate has 6 documented interactions. The most notable include Ciprofloxacin, Doxycycline, Iron, Levofloxacin, and Zinc. Check any specific combination before taking it and confirm with your prescriber.
Does Calcium Carbonate deplete any nutrients?
Calcium Carbonate is associated with lowering Iron, Vitamin B12, and Folate with prolonged use. Useful biomarkers to monitor include Ferritin + transferrin saturation, Serum B12 + methylmalonic acid, and Serum folate or RBC folate. Ask your prescriber before adding any replacement supplement.
Is it safe to take Ciprofloxacin with Calcium Carbonate?
NutriStack classifies the Ciprofloxacin and Calcium Carbonate pairing as timing sensitive: Calcium carbonate, whether taken as an antacid or calcium supplement, binds ciprofloxacin in the gut and reduces its absorption by 30 to 50 percent. Even... Take ciprofloxacin at least 2 hours before or 6 hours after calcium carbonate. Avoid taking with calcium-fortified drinks or dairy in the same window. Always confirm with your prescriber.
Check your whole stack
See how calcium carbonate fits your supplements.
NutriStack screens your full routine for interactions and depletions, and updates the moment you change it.