Can You Take Calcium and Doxycycline (Low Dose) Together?

Use extra care with this pair

The short answer

Calcium forms insoluble chelates with doxycycline, significantly reducing its absorption and effectiveness.

How to arrange timing

Separate low-dose doxycycline from calcium supplements by at least 3 hours.

Reference

Reference noted for this combination: Product labeling; NatMed Pro

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.