Therapeutic Classification

h2 blocker Registry

Clinical reference for h2 blocker medications. Access safety monographs, dosing adjustments, and drug-drug interactions for all registered brand names and generics in this class.

Registered Medications (h2 blocker)

Medication	Therapeutic Class	Maternal Safety
CIMETIDINE Inhibits CYP450 enzymes increasing levels of many drugs (eg warfarin phenytoin) Mental confusion and dizziness are more common in elderly or severely ill patients.	H2 Blocker	safe
CIMETIDINE HYDROCHLORIDE Inhibits CYP450 enzymes increasing levels of many drugs (eg warfarin phenytoin) Mental confusion and dizziness are more common in elderly or severely ill patients.	H2 Blocker	safe
FAMOTIDINE No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe
FAMOTIDINE PRESERVATIVE FREE No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe
FAMOTIDINE PRESERVATIVE FREE (PHARMACY BULK) No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe
FAMOTIDINE PRESERVATIVE FREE IN PLASTIC CONTAINER No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe
NIZATIDINE No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe
RANITIDINE No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe
RANITIDINE HYDROCHLORIDE No significant drug interactions May cause confusion more commonly in elderly or severely ill patients.	H2 Blocker	safe

This therapeutic registry is dynamically synthesized from professional clinical sources. Listing of a medication does not imply equivalence; refer to individual monographs for head-to-head pharmacological data.