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Proamatine

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Proamatine

Overdosage
Contraindications

OVERDOSE

Symptoms of overdose could include hypertension, piloerection (goosebumps), a sensation of coldness and urinary retention. There are 2 reported cases of overdosage with ProAmatine® (midodrine hydrochloride) , both in young males. One patient ingested ProAmatine® (midodrine hydrochloride) drops, 250 mg, experienced systolic blood pressure greater than 200 mmHg, was treated with an IV injection of 20 mg of phentolamine, and was discharged the same night without any complaints. The other patient ingested 205 mg of ProAmatine® (midodrine hydrochloride) (41 5-mg tablets), and was found lethargic and unable to talk, unresponsive to voice but responsive to painful stimuli, hypertensive and bradycardic. Gastric lavage was performed, and the patient recovered fully by the next day without sequelae. The single doses that would be associated with symptoms of overdosage or would be potentially life-threatening are unknown. The oral LD50 is approximately 30 to 50 mg/kg in rats, 675 mg/kg in mice, and 125 to 160 mg/kg in dogs. Desglymidodrine is dialyzable.

Recommended general treatment, based on the pharmacology of the drug, includes induced emesis and administration of alpha-sympatholytic drugs (e.g., phentolamine).

CONTRAINDICATIONS

ProAmatine® (midodrine hydrochloride) is contraindicated in patients with severe organic heart disease, acute renal disease, urinary retention, pheochromocytoma or thyrotoxicosis. ProAmatine® (midodrine hydrochloride) should not be used in patients with persistent and excessive supine hypertension.

Last reviewed on RxList: 10/25/2010
This monograph has been modified to include the generic and brand name in many instances.

Overdosage
Contraindications
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