Drug lookup
Drug reference

isoxsuprine

β receptor stimulant · Uterine relaxant, Vasodilator

β receptor stimulantUterine relaxant, Vasodilator
CDSCO approved
EXCRETION
not curated
INTERACTIONS
1 major
SEVERE in our sources
PREGNANCY
not curated
Top interactionssee all 10
  • TizanidineSevereDatabaseDDInter

Mechanism

Isoxsuprine is an orally effective long-acting β receptor stimulant that also has direct smooth muscle relaxant properties.

Indications

Uterine relaxant (threatened abortion, dysmenorrhoea)Peripheral vascular diseases (efficacy poor)Cerebral vascular diseases (efficacy poor)

Dosing

Adult
5–10 mg oral, i.m. 4–6 hourly

Side effects

Common
NauseaTachycardiaFlushingHypotensionDizzinessTremor

Drug interactions

Tizanidine
Severe
Database

Clinical effect not specified

Source: DDInter

Antihypertensives
Moderate
Database

Increased risk of hypotension, orthostatic hypotension, dizziness, and syncope.

Monitor blood pressure closely, especially during initiation or dose adjustments of either drug. Consider reducing the dose of antihypertensive agents if symptomatic hypotension occurs. Advise patients to rise slowly from a sitting or lying position.

Beta Blockers
Moderate
Database

Reduced efficacy of isoxsuprine (e.g., for tocolysis or peripheral vasodilation). Beta-blockers may also mask the signs of isoxsuprine-induced tachycardia.

Monitor for reduced therapeutic effect of isoxsuprine. If used for tocolysis, consider alternative agents or increased monitoring for uterine contractions. Be aware that beta-blockers can mask tachycardia, a common side effect of isoxsuprine.

Ephedrine Or Pseudoephedrine
Moderate
Database

Increased risk of tachycardia, palpitations, hypertension, and other cardiovascular adverse effects.

Avoid concomitant use due to the increased risk of cardiovascular stimulation. If co-administration is unavoidable, monitor cardiovascular parameters closely.

General Anesthetics
Moderate
Database

Increased risk of hypotension during surgery. Isoxsuprine's beta-adrenergic effects might interact with anesthetic agents, potentially leading to arrhythmias.

Inform the anesthesiologist about isoxsuprine use. Monitor blood pressure and cardiac rhythm closely during surgery. Be prepared to manage hypotension.

Monoamine Oxidase Inhibitors (maois)
Moderate
Database

Increased risk of hypertension, tachycardia, and other cardiovascular adverse effects.

Use with caution. Monitor blood pressure and heart rate closely. Consider alternative treatments if possible. If co-administration is necessary, start with low doses and titrate carefully.

Nitrates
Moderate
Database

Potentiated hypotensive effects, leading to increased risk of dizziness, syncope, and falls.

Avoid concomitant use if possible. If co-administration is necessary, monitor blood pressure frequently and advise patients about the signs and symptoms of hypotension. Adjust doses as needed.

Phosphodiesterase 5 (pde5) Inhibitors (e.g., Sildenafil, Tadalafil)
Moderate
Database

Significant potentiation of hypotensive effects, leading to severe hypotension, syncope, and potentially cardiovascular collapse.

Avoid concomitant use due to the high risk of severe hypotension. If a patient is on isoxsuprine, PDE5 inhibitors should be used with extreme caution or avoided.

Thyroid Hormones (e.g., Levothyroxine)
Moderate
Database

Increased risk of cardiovascular adverse effects (e.g., tachycardia, arrhythmias, angina) when isoxsuprine is used in patients with hyperthyroidism or those on thyroid hormone replacement.

Use with caution, especially in patients with pre-existing cardiac conditions. Monitor heart rate and rhythm. Consider lower doses of isoxsuprine.

Tricyclic Antidepressants (tcas)
Moderate
Database

Increased risk of orthostatic hypotension, dizziness, and syncope. TCAs may also potentiate the cardiac stimulant effects of isoxsuprine.

Monitor blood pressure and heart rate closely. Advise patients about orthostatic hypotension. Consider lower starting doses of either drug and titrate carefully.

2 additional low-confidence interactions hidden — those rows lack a documented mechanism or management plan in our sources.

Related guidelines

Ask House about isoxsuprine

Continue into a citation-backed clinical answer with the drug context already attached.

Sources: KD Tripathi 7e·Verified: 2026-05-10 · House clinical team