About LearnDrugs.com
A free, open pharmacology reference for Registered Nurses and nursing students — every drug class organized by body system, with the NCLEX high-yield facts a nurse is accountable for. It is built to be calm, scannable, and — above all — trustworthy.
Who it's for
Nursing students preparing for the NCLEX, and practicing nurses who want a fast refresher on a drug class they don't reach for every day. Content is framed around what the nurse is responsible for — assessment, monitoring, hold parameters, high-alert handling, and patient teaching — not the prescriber's dosing decisions.
How the content is made — and verified
Every drug class is researched from authoritative sources, in a strict order of authority. A risk-critical claim — a black-box warning, a contraindication, a serious adverse effect — must trace back to a top-tier source, or it doesn't ship.
- FDA prescribing information via DailyMed (dailymed.nlm.nih.gov)
The authority for indications, black-box warnings, and contraindications.
- Peer-reviewed & government references StatPearls (NCBI), MedlinePlus, NIH, CDC
Mechanism, pharmacology, and monitoring, corroborated against primary literature.
- Nursing & safety standards ISMP high-alert lists and RN practice standards
The nurse-specific layer: what to assess, hold parameters, and high-alert handling.
The highest-yield NCLEX facts — antidotes, therapeutic and toxic drug levels, hold rules, and the interactions worth memorizing — went through additional rounds of adversarial verification: each fact was checked against the sources above and challenged from multiple angles, and anything that couldn't be corroborated was dropped rather than guessed. When the FDA discontinued the clozapine REMS program in 2025, for example, that claim was removed across the site.
Because this is a study aid, we teach the principle — which antidote, which level, which hold rule, and why — rather than doses to administer. Every class page lists the sources it was built from and the date it was last reviewed, so you can check our work.
Clinical review
What LearnDrugs.com is not
It is a study reference, not a clinical decision tool, and not medical advice. Drug information changes; always verify against current prescribing information and your facility's policy before acting in practice. If you spot something out of date or wrong, that feedback is welcome — accuracy here matters more than being comprehensive.