Vitamins & supplements
Small print, real interactions
Deficiencies and electrolyte replacement — vitamin D, B12, folate, iron, calcium, magnesium and potassium.
Replaces a nutrient or electrolyte the body is short of.
The 8 vitamins & supplements in the PTCB Top 200
| Generic | Brand | Common use |
|---|---|---|
| Potassium Chloride | Klor-Con / K-Dur | potassium replacement |
| Ergocalciferol | Drisdol | vitamin D deficiency |
| Cholecalciferol | OTC (Vitamin D3) | vitamin D deficiency |
| Ferrous Sulfate | Feosol (OTC) | iron deficiency anemia |
| Folic Acid | Folvite | folate deficiency, pregnancy |
| Cyanocobalamin | OTC (Vitamin B12) | B12 deficiency |
| Magnesium Salts | OTC (Magnesium) | Mg deficiency, constipation |
| Calcium | Tums / Caltrate | heartburn, calcium supplement |
Tap any generic name for its full drug guide — brand↔generic, side effects, interactions and the exam tip.
What to know for the exam
- check_circleIron is absorbed better on an empty stomach, and vitamin C improves absorption further.
- check_circleIron, calcium and magnesium all bind other drugs and reduce their absorption.
- check_circleFolic acid is recommended before and during pregnancy.
- check_circlePotassium chloride extended-release tablets are swallowed whole.
Potassium chloride is a high-alert medication. Too much can cause dangerous heart-rhythm problems.
Separate iron and calcium from levothyroxine, doxycycline and the fluoroquinolones by several hours.
Drill vitamins & supplements the way the PTCE asks them
RxReflex groups the Top 200 drugs into classes like this one, then quizzes you on brand↔generic, class, side effects and interactions. Plus a guided Learn path, pharmacy math and 40+ cheat sheets. Free to start.
Frequently asked
What drugs are in the vitamins & supplements class? add
Potassium Chloride, Ergocalciferol, Cholecalciferol, Ferrous Sulfate, Folic Acid, Cyanocobalamin, Magnesium Salts, Calcium. All are in the PTCB Top 200.
What are vitamins & supplements used for? add
Deficiencies and electrolyte replacement — vitamin D, B12, folate, iron, calcium, magnesium and potassium.
How do vitamins & supplements work? add
Replaces a nutrient or electrolyte the body is short of.
Last reviewed August 7, 2026. For education only — not medical advice. Not affiliated with or endorsed by the PTCB.