Drug reference directory
Drug reference

guanethidine

Drug monograph

CDSCO approved
EXCRETION
—
not curated
INTERACTIONS
1 major
SEVERE in our sources
PREGNANCY
—
not curated
Top interactionssee all 2 →
  • TizanidineSevereDatabaseDDInter

Mechanism

Not yet extracted

Indications

Antihypertensive (historically, no longer in use)

Pharmacokinetics

Protein binding
Guanethidine is a 'hit and run' drug, meaning its effect lasts much longer than the drug itself.

Side effects

Serious
  • marked side effects

Drug interactions

Tizanidine
Severe
Database

Clinical effect not specified

Source: DDInter

Minoxidil
Moderate
Database

Additive hypotensive effect; orthostatic hypotension risk

Monitor BP closely; adjust doses

Source: Kimi deep-research + Cla

10 additional unreviewed or low-confidence interactions hidden because their provenance or source detail is insufficient.

Related guidelines

Other Unclassified drugs

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Textbook-sourced·Sources: KD Tripathi 7e·Updated: 2026-05-10