Drug Classifications & Nutrition

Learning Objectives

  • Identify common drug classifications and their effects on nutrition.
  • Understand how certain medications influence nutrient absorption, metabolism, or excretion.
  • Demonstrate the ability to suggest basic dietary adjustments based on drug-nutrient interactions.

Importance of Understanding Drug-Nutrient Interactions

  • Prevent nutrient deficiencies or toxicities.
  • Optimize drug efficacy.
  • Reduce adverse effects.
  • Guide dietary modifications during therapy.

Common Drug Classifications Related to Nutrition

  • Gastrointestinal Drugs
  • Anticonvulsants
  • Antihypertensive Agents
  • Hypoglycemic Agents
  • Lipid-Lowering Agents
  • Antibacterial Agents
  • Corticosteroids
  • Appetite-Modifying Drugs
  • Antipsychotic Drugs

Gastrointestinal Drugs

  • Proton Pump Inhibitors (PPIs): Long-term use reduces vitamin B12, magnesium, calcium absorption.
  • H2 Receptor Antagonists: May impair iron and B12 absorption due to reduced gastric acid.
  • Antacids:
    • Aluminum: Constipation
    • Magnesium: Diarrhea
  • Laxatives: Chronic use may cause electrolyte imbalance (e.g., potassium loss).

Anticonvulsants

  • Antiepileptics: Induce hepatic enzymes which increases metabolism of vitamin D, folate (B9).

Antihypertensive Drugs

  • Loop Diuretics: Increased loss of potassium, magnesium, calcium, thiamine.
  • Thiazide Diuretics: Increases calcium retention, may reduce potassium, magnesium.
  • ACE Inhibitors: Can increase potassium levels, requiring dietary monitoring.

Hypoglycemic Agents

  • Insulin: Requires synchronization with carbohydrate intake to avoid hypoglycemia.
  • Sulfonylureas: Risk of hypoglycemia with poor oral intake.
  • Biguanides: May reduce vitamin B12 absorption; consider supplementation.

Lipid-Lowering Agents

  • Statins: Some may reduce Coenzyme Q10 levels; possible muscle-related side effects.
  • Bile Acid Sequestrants: Can reduce absorption of vitamins A, D, E, K, folate, and iron.

Antibacterial Agents

  • Anti-TB Drugs: Isoniazid interferes with vitamin B6 metabolism, supplementation needed.
  • Broad-Spectrum Antibiotics: Can alter gut flora, reduce vitamin K synthesis; diarrhea affects nutrient loss.

Corticosteroids

  • Glucocorticoids: Long-term use leads to calcium, vitamin D loss which increases the risk of osteoporosis, also may cause hyperglycemia.

Appetite-Modifying Drugs

  • Appetite Stimulants: Increases appetite and weight gain in cancer/cachexia patients.
  • Appetite Suppressants: Used in weight loss; may decrease food intake and impact micronutrient levels.

Antipsychotic Drugs

  • Antipsychotics: Can increase appetite, weight, lipids, and glucose levels.
  • SSRIs and TCAs: May affect appetite, weight, and cause nausea or dry mouth.