Feeding Tubes

Definition

Feeding tubes are medical devices used to deliver enteral nutrition, fluids, and medications to patients who cannot meet nutritional needs orally but have a functional gastrointestinal tract. Selection depends on duration of therapy, aspiration risk, gastric function, and patient-specific factors.

1. Nasogastric Tube (NGT)

Route: Nose → stomach

Duration: Short-term (≤4–6 weeks)

  • Uses:
    • Enteral feeding
    • Medication administration
    • Gastric decompression
  • Advantages:
    • Easy bedside placement
  • Limitations:
    • Aspiration risk
    • Nasal and esophageal irritation

2. Nasoduodenal Tube (NDT)

Route: Nose → duodenum

Duration: Short-term

  • Uses:
    • Feeding when gastric feeding is not tolerated
  • Advantages:
    • Lower aspiration risk than NGT
  • Limitations:
    • More difficult placement
    • Limited medication administration options

3. Nasojejunal Tube (NJT)

Route: Nose → jejunum

Duration: Short-term

  • Uses:
    • Severe gastroparesis
    • Pancreatitis
    • High aspiration risk
  • Advantages:
    • Minimal aspiration risk
  • Limitations:
    • Continuous feeding only
    • Drug absorption concerns

4. Gastrostomy Tube (G-Tube / PEG)

Route: Abdominal wall → stomach

Duration: Long-term (>4–6 weeks)

  • Uses:
    • Chronic dysphagia (e.g., stroke, ALS)
  • Advantages:
    • Suitable for bolus feeds
    • Durable access
  • Limitations:
    • Aspiration still possible
    • Site infection risk

5. Gastrojejunostomy Tube (GJ-Tube)

Route: Abdominal wall → stomach + jejunum

Duration: Long-term

  • Uses:
    • Poor gastric emptying
    • High aspiration risk
  • Advantages:
    • Jejunal feeding with gastric decompression
  • Limitations:
    • Tube migration
    • Continuous feeds required

6. Jejunostomy Tube (J-Tube)

Route: Abdominal wall → jejunum

Duration: Long-term

  • Uses:
    • Severe gastroparesis
    • Post-gastric surgery
  • Advantages:
    • Lowest aspiration risk
  • Limitations:
    • Limited medication options
    • Continuous feeding only

Pharmacist’s Clinical Pearls

  • Medication formulation matters: Prefer liquid formulations; avoid crushing modified-release or enteric-coated tablets
  • Jejunal tubes: Drug absorption may be reduced (e.g., phenytoin, levothyroxine)
  • Flush protocols: Before and after medications to prevent clogging
  • Drug–nutrition interactions: Hold feeds for drugs with absorption issues when appropriate
  • Avoid sorbitol-containing liquids if diarrhea occurs
  • Verify tube placement before medication administration

Medication Administration Compatibility Table – Enteral Feeding Tubes

Drug/Class Preferred Formulation Tube Type Considerations Administration Tips / Warnings
Acetaminophen Liquid, immediate-release NGT, NJT, G-Tube, J-Tube Can be given as crushed tablets in water; avoid extended-release formulations
NSAIDs (e.g., ibuprofen) Liquid NGT, G-Tube Give with feeds to reduce GI irritation; avoid crushing enteric-coated tablets
Opioids (e.g., morphine) Liquid NGT, G-Tube Extended-release tablets should not be crushed; use immediate-release forms only
Antibiotics Liquid, IV if unavailable orally NGT, NJT, G-Tube, J-Tube Many IV formulations can be administered via tube; check pH and adsorption compatibility
Phenytoin Immediate-release oral NGT, G-Tube Hold enteral feeds 1–2 h before and after to avoid reduced absorption
Levothyroxine Oral tablet or solution NGT, G-Tube Hold enteral feeds 30–60 min before and after dose; monitor TSH
Warfarin Oral tablet NGT, G-Tube Can be crushed and administered via tube; maintain consistent feeding schedule
Proton Pump Inhibitors (e.g., omeprazole) Capsule contents in water or liquid formulation NGT, G-Tube Do not crush delayed-release tablets; use liquid suspensions
Sucralfate Suspension NGT, G-Tube Administer 2 h apart from other drugs due to binding interactions
Potassium Chloride Liquid or dispersible tablet NGT, G-Tube Avoid crushing extended-release; dilute in water and flush tube before and after
Acyclovir Oral suspension NGT, G-Tube Safe via tube; ensure adequate hydration
Prednisone / Corticosteroids Liquid All tube types Can be crushed or in liquid; flush tube after administration
Insulin Subcutaneous only N/A Cannot be given via enteral tube; consider subcutaneous injection
Antacids (Al/Mg hydroxide) Suspension NGT, G-Tube Flush tube after administration; avoid mixing with other medications due to binding
Diuretics (furosemide) Liquid NGT, G-Tube Can be administered crushed; monitor electrolytes

Pharmacist Administration Pearls

  1. Crushing medications: Only crush immediate-release tablets; never crush extended-release or enteric-coated.
  2. Flush protocols:
    • Before medications: 15–30 mL water
    • Between medications: 15–30 mL water
    • After medications: 30–60 mL water
    • Continuous feeds: consider pausing 30–60 min before and after sensitive drugs.
  3. Feeding tube location matters:
    • Gastric vs jejunal: Some drugs (e.g., phenytoin, levothyroxine) have reduced absorption in jejunal placement.
  4. Drug-feed interactions: Hold enteral nutrition temporarily for drugs with absorption issues (phenytoin, fluoroquinolones, tetracyclines, levothyroxine).
  5. Liquid formulations: Preferred for continuous enteral feeding; check stability and pH compatibility.
  6. IV alternatives: Consider for drugs incompatible with enteral administration or high aspiration risk.