Proamatine
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Questions & Answers
Side Effects & Adverse Reactions
Supine Hypertension: The most potentially serious adverse reaction associated with ProAmatine® therapy is marked elevation of supine arterial blood pressure (supine hypertension). Systolic pressure of about 200 mmHg were seen overall in about 13.4% of patients given 10 mg of ProAmatine®. Systolic elevations of this degree were most likely to be observed in patients with relatively elevated pre-treatment systolic blood pressures (mean 170 mmHg). There is no experience in patients with initial supine systolic pressure above 180 mmHg, as those patients were excluded from the clinical trials. Use of ProAmatine® in such patients is not recommended. Sitting blood pressures were also elevated by ProAmatine® therapy. It is essential to monitor supine and sitting blood pressures in patients maintained on ProAmatine®.
Legal Issues
There is currently no legal information available for this drug.
FDA Safety Alerts
There are currently no FDA safety alerts available for this drug.
Manufacturer Warnings
There is currently no manufacturer warning information available for this drug.
FDA Labeling Changes
There are currently no FDA labeling changes available for this drug.
Uses
ProAmatine® is indicated for the treatment of symptomatic orthostatic hypotension (OH). Because ProAmatine® can cause marked elevation of supine blood pressure (BP>200 mmHg systolic), it should be used in patients whose lives are considerably impaired despite standard clinical care, including non-pharmacologic treatment (such as support stockings), fluid expansion, and lifestyle alterations. The indication is based on ProAmatine®'s effect on increases in 1-minute standing systolic blood pressure, a surrogate marker considered likely to correspond to a clinical benefit. At present, however, clinical benefits of ProAmatine®, principally improved ability to perform life activities, have not been established. Further clinical trials are underway to verify and describe the clinical benefits of ProAmatine®.
After initiation of treatment, ProAmatine® should be continued only for patients who report significant symptomatic improvement.
History
There is currently no drug history available for this drug.
Other Information
Name: ProAmatine®(midodrine hydrochloride) Tablets
Dosage Form: 2.5-mg, 5-mg and 10-mg tablets for oral administration
Active Ingredient: Midodrine hydrochloride, 2.5 mg, 5 mg and 10 mg
Inactive Ingredients: Colloidal Silicone Dioxide NF, Corn Starch NF, FD&C Blue No. 2 Lake (10-mg tablets), FD&C Yellow No. 6 Lake (5-mg tablet), Magnesium Stearate NF, Microcrystalline Cellulose NF, Talc USP
Pharmacological Classification: Vasopressor/Antihypotensive
Chemical Names (USAN: Midodrine Hydrochloride): (1) Acetamide, 2-amino-N-[2-(2,5-dimethoxyphenyl)-2-hydroxyethyl]-monohydrochloride, (±)-;
(2) (±)-2-amino-N-(β-hydroxy-2,5-dimethoxyphenethyl)acetamide monohydrochloride
BAN, INN, JAN: Midodrine
Structural formula:
Molecular formula: C12H18N2O4HCl; Molecular Weight: 290.7
Organoleptic Properties: Odorless, white, crystalline powder
Solubility: Water: Soluble
Methanol: Sparingly soluble
pKa: 7.8 (0.3% aqueous solution) pH: 3.5 to 5.5 (5% aqueous solution)
Melting Range: 200 to 203°C
Sources
Proamatine Manufacturers
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Shire Us Manufacturing Inc.
![Proamatine (Midodrine Hydrochloride) Tablet [Shire Us Manufacturing Inc.]](/wp-content/themes/bootstrap/assets/img/loading2.gif)
Proamatine | Shire Us Manufacturing Inc.
The recommended dose of ProAmatine® is 10 mg, 3 times daily. Dosing should take place during the daytime hours when the patient needs to be upright, pursuing the activities of daily living. A suggested dosing schedule of approximately 4-hour intervals is as follows: shortly before, or upon arising in the morning, midday and late afternoon (not later than 6 P.M.). Doses may be given in 3-hour intervals, if required, to control symptoms, but not more frequently. Single doses as high as 20 mg have been given to patients, but severe and persistent systolic supine hypertension occurs at a high rate (about 45%) at this dose. In order to reduce the potential for supine hypertension during sleep, ProAmatine® should not be given after the evening meal or less than 4 hours before bedtime. Total daily doses greater than 30 mg have been tolerated by some patients, but their safety and usefulness have not been studied systematically or established. Because of the risk of supine hypertension, ProAmatine® should be continued only in patients who appear to attain symptomatic improvement during initial treatment.
The supine and standing blood pressure should be monitored regularly, and the administration of ProAmatine® should be stopped if supine blood pressure increases excessively.
Because desglymidodrine is excreted renally, dosing in patients with abnormal renal function should be cautious; although this has not been systematically studied, it is recommended that treatment of these patients be initiated using 2.5-mg doses.
Dosing in children has not been adequately studied.
Blood levels of midodrine and desglymidodrine were similar when comparing levels in patients 65 or older vs. younger than 65 and when comparing males vs. females, suggesting dose modifications for these groups are not necessary.
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Physicians Total Care, Inc.
Proamatine | Physicians Total Care, Inc.
The recommended dose of ProAmatine® is 10 mg, 3 times daily. Dosing should take place during the daytime hours when the patient needs to be upright, pursuing the activities of daily living. A suggested dosing schedule of approximately 4-hour intervals is as follows: shortly before, or upon arising in the morning, midday and late afternoon (not later than 6 P.M.). Doses may be given in 3-hour intervals, if required, to control symptoms, but not more frequently. Single doses as high as 20 mg have been given to patients, but severe and persistent systolic supine hypertension occurs at a high rate (about 45%) at this dose. In order to reduce the potential for supine hypertension during sleep, ProAmatine® should not be given after the evening meal or less than 4 hours before bedtime. Total daily doses greater than 30 mg have been tolerated by some patients, but their safety and usefulness have not been studied systematically or established. Because of the risk of supine hypertension, ProAmatine® should be continued only in patients who appear to attain symptomatic improvement during initial treatment.
The supine and standing blood pressure should be monitored regularly, and the administration of ProAmatine® should be stopped if supine blood pressure increases excessively.
Because desglymidodrine is excreted renally, dosing in patients with abnormal renal function should be cautious; although this has not been systematically studied, it is recommended that treatment of these patients be initiated using 2.5-mg doses.
Dosing in children has not been adequately studied.
Blood levels of midodrine and desglymidodrine were similar when comparing levels in patients 65 or older vs. younger than 65 and when comparing males vs. females, suggesting dose modifications for these groups are not necessary.
![Proamatine (Midodrine Hydrochloride) Tablet [Physicians Total Care, Inc.]](http://dailymed.nlm.nih.gov/dailymed/image.cfm?setid=9e8874f0-ad2e-41ce-8a35-bed819615a5d&name=packagelabel.jpg)
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