ISOXSUPRINE HYDROCHLORIDE

ISOXSUPRINE HYDROCHLORIDe
(eye-sox'syoo-preen)
Vasodilan, Voxsuprine
Classifications: beta-adrenergic agonist; vasodilator;
Therapeutic: vasodilator
; beta-adrenergic agonist; alpha-adrenergic inhibitor
Prototype: Albuterol
Pregnancy Category: C

Availability

10 mg, 20 mg tablets

Action

Sympathomimetic with beta-adrenergic stimulant activity and with an inhibitory effect on alpha receptors. Vasodilating action on arteries within skeletal muscles is greater than on cutaneous vessels.

Therapeutic Effect

Has both cerebral and peripheral vasodilatory properties.

Uses

Adjunctive therapy in treatment of cerebral vascular insuf-ficiency and peripheral vascular disease, such as arteriosclerosis obliterans, thromboangiitis obliterans (Buerger's disease), and Raynaud's disease.

Contraindications

Immediately postpartum; presence of arterial bleeding; parenteral use in presence of hypotension, fetal distress; intrauterine fetal death; vaginal bleeding; tachycardia; pregnancy (category C).

Cautious Use

Bleeding disorders; severe cerebrovascular disease, severe obliterative coronary artery disease, recent MI; lactation.

Route & Dosage

Cerebral Vascular Insufficiency, Peripheral Vascular Disease
Adult: PO 10–20 mg t.i.d. or q.i.d.

Administration

Oral
  • When used with premature labor: Do not give immediately after delivery because it causes uterine relaxation, or in the presence of arterial bleeding.

Adverse Effects (≥1%)

CV: Flushing, orthostatic hypotension with light-headedness, faintness; palpitation, tachycardia. CNS: Dizziness, nervousness, trembling, weakness. GI: Nausea, vomiting, abdominal distress, abdominal distention.

Pharmacokinetics

Absorption: Readily from GI tract. Peak: 1 h. Duration: 3 h. Distribution: Crosses placenta. Metabolism: In blood. Elimination: In urine. Half-Life: 1.25 h.

Nursing Implications

Assessment & Drug Effects

  • Monitor for therapeutic effectiveness: Response to treatment of peripheral vascular disorders may take several weeks. Evaluate clinical manifestations of arterial insufficiency.
  • Monitor BP and pulse; may cause hypotension and tachycardia. Supervise ambulation.
  • Observe both mother and baby for hypotension and irregular and rapid heartbeat if isoxsuprine is used to delay premature labor. Hypocalcemia, hypoglycemia, and ileus have been observed in babies born of mothers taking isoxsuprine.

Patient & Family Education

  • Notify physician of adverse reactions (skin rash, palpitation, flushing) promptly; symptoms are usually effectively controlled by dosage reduction or discontinuation of drug.
  • Prevent orthostatic hypotension by making position changes slowly and in stages, particularly from lying down to sitting upright and avoid standing still.
  • Note: For treatment of menstrual cramps, isoxsuprine is usually started 1–3 d before onset of menstruation and continued until pain is relieved or menstrual flow stops.

Common adverse effects in italic, life-threatening effects underlined; generic names in bold; classifications in SMALL CAPS; Canadian drug name; Prototype drug

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