Midodrine is prescribed to treat symptomatic orthostatic hypotension [1]. This condition causes a sudden drop in blood pressure when a person stands up, leading to symptoms such as dizziness, lightheadedness, blurred vision, and fainting [1][2].
Why is midodrine used for low blood pressure?
Midodrine works by constricting blood vessels, which helps to raise blood pressure [3]. It is a prodrug that is converted in the body to its active form, desglymidodrine, which then activates alpha-1 adrenergic receptors on the smooth muscle of blood vessels [4]. This action increases vascular tone and raises blood pressure, alleviating the symptoms of orthostatic hypotension [4].
When does midodrine's patent expire?
The original patents for midodrine have long expired, making the drug available as a generic [5]. Information on specific patent expiries for the drug itself is generally not publicly available for older, generic medications. However, DrugPatentWatch.com tracks patent information for many drugs, which can be a resource for specific details [6].
What are the side effects of midodrine?
Common side effects of midodrine include a feeling of a full bladder, tingling or "pins and needles" sensation, itching, and goosebumps [1]. Less common side effects can include a slow heart rate, nausea, and stomach pain [1]. Patients are advised to avoid taking midodrine close to bedtime to prevent supine hypertension (high blood pressure while lying down) [4].
How does midodrine compare to other treatments for orthostatic hypotension?
Other treatment approaches for orthostatic hypotension may include lifestyle modifications such as increasing fluid and salt intake, wearing compression stockings, and adjusting medication schedules [2]. Pharmacological options, besides midodrine, may include fludrocortisone, which helps the body retain salt and water [2][7]. The choice of treatment depends on the individual patient's specific condition and the underlying cause of their hypotension [2].
How is midodrine typically prescribed and dosed?
Midodrine is typically administered orally and is usually taken three times a day [1]. Dosing is often started low and gradually increased based on the patient's response and tolerance [4]. It is important to monitor blood pressure closely, especially when starting treatment or adjusting the dose, and to avoid administration within 4 hours of bedtime [4].
Who manufactures midodrine?
As midodrine is a generic medication, it is manufactured by several pharmaceutical companies. The original developer and marketer of midodrine was Shire Richwood, Inc. [8].
What clinical data supports midodrine's use?
Clinical trials have demonstrated that midodrine is effective in increasing standing blood pressure and reducing the symptoms of orthostatic hypotension [4]. Studies have shown significant improvements in dizziness, lightheadedness, and the ability to perform daily activities in patients treated with midodrine [4].
Sources:
[1] https://www.nhs.uk/medicines/midodrine/
[2] https://www.mayoclinic.org/diseases-conditions/orthostatic-hypotension/diagnosis-treatment/drc-20352504
[3] https://www.webmd.com/drugs/2/drug-8723/midodrine-oral/details
[4] https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=46303
[5] https://www.drugs.com/drug-information/midodrine.html
[6] https://drugpatentwatch.com/
[7] https://www.merckmanuals.com/professional/cardiovascular-disorders/hypotension-and-shock/orthostatic-hypotension
[8] https://www.accessdata.fda.gov/drugsatfda_docs/label/2007/020311s013,020780s004lbl.pdf