NG‑Tube Administration of Minocycline Capsules

Guideline Authority

The CDC’s 2021 antimicrobial treatment guidelines for plague state that all oral antimicrobials recommended in the guideline—including minocycline—may be administered via alternative enteral routes such as nasogastric (NG) tubes, with ciprofloxacin as the sole exception. 1

Prior to delivering the minocycline suspension, flush the NG tube with 30 mL of water to prime the line and reduce clog risk. 4
Deliver the opened‑capsule minocycline contents as a water‑based suspension through the NG tube. 1
After the suspension is given, flush the NG tube with another 30 mL of water to clear residual drug and prevent tube occlusion. 4
When multiple medications are administered sequentially, perform a 30 mL water flush between each drug to avoid cross‑contamination and blockage. 4

Use ENFit connectors (ISO 80369‑3 standard) for all enteral tubing to prevent fatal misconnections. 4
With low‑dose ENFit tip syringes, do not shake the syringe to remove the drug “moat,” as agitation can alter the delivered dose. 4
Never mix multiple medications together before administration through the NG tube, because of potential drug‑drug interactions. 4
Inadequate flushing volumes are the primary cause of NG‑tube occlusion; always use the recommended 30 mL flushes. 4

Pediatric patients: administer minocycline at 2 mg/kg every 12 hours orally (maximum 100 mg per dose) using the same NG‑tube preparation and flushing protocol. 1
Pregnant women: give a 200 mg loading dose of minocycline followed by 100 mg every 12 hours orally via NG tube; note that in‑utero exposure may cause permanent tooth discoloration in the fetus. 2