Midodrine Hydrochloride is the hydrochloride salt form of midodrine, a sympathomimetic pharmaceutical compound and prodrug associated with peripheral vasoconstrictor activity. It is converted in the body to its major active metabolite, desglymidodrine, which selectively activates alpha-1 adrenergic receptors in the arteriolar and venous vasculature. This mechanism increases vascular tone and contributes to an elevation in blood pressure.
Midodrine Hydrochloride is primarily associated with pharmaceutical formulations intended for the management of certain forms of symptomatic hypotension. As an active pharmaceutical ingredient, it is an important material for pharmaceutical development and manufacturing where controlled alpha-adrenergic activity and peripheral vascular effects are required.
The compound is supplied as a hydrochloride salt and is described as an odorless, white, crystalline powder. FDA documentation reports that Midodrine Hydrochloride is soluble in water, sparingly soluble in methanol, and has a melting range of approximately 200–203°C.
Midodrine Hydrochloride belongs to the class of compounds with sympathomimetic and alpha-adrenergic activity. Unlike directly administered active alpha-1 agonists, midodrine acts as a prodrug and is metabolized to desglymidodrine, the pharmacologically active metabolite.
The active metabolite acts predominantly at peripheral alpha-1 adrenergic receptors. Activation of these receptors produces contraction of vascular smooth muscle, increasing vascular resistance and venous tone. This pharmacological activity forms the basis for the use of midodrine hydrochloride in pharmaceutical products designed for certain hypotensive conditions.
For pharmaceutical manufacturers and formulation developers, Midodrine Hydrochloride can serve as an API for the development and production of appropriate oral dosage forms, subject to applicable regulatory requirements and product-specific specifications.
Midodrine Hydrochloride is a hydrochloride salt containing the midodrine active moiety and hydrochloride component. PubChem lists its molecular formula as C₁₂H₁₉ClN₂O₄ and molecular weight as 290.74 g/mol. Its IUPAC name is 2-amino-N-[2-(2,5-dimethoxyphenyl)-2-hydroxyethyl]acetamide; hydrochloride.
The compound contains functional groups associated with its amino-acetamide and substituted aromatic structure. Its physicochemical properties are relevant to API characterization, analytical testing, formulation development, and pharmaceutical quality control.
Midodrine Hydrochloride functions as a prodrug. After administration, midodrine is converted to its principal active metabolite, desglymidodrine.
Desglymidodrine acts as an alpha-1 adrenergic receptor agonist. Activation of alpha-1 adrenergic receptors in vascular smooth muscle causes vasoconstriction of the arteriolar and venous vasculature. This increases vascular tone and contributes to increased blood pressure.
The active metabolite has limited penetration across the blood-brain barrier, and its pharmacological activity is primarily associated with peripheral adrenergic receptors rather than central nervous system stimulation.
Midodrine Hydrochloride is used as an API in pharmaceutical products associated with the treatment of certain hypotensive states. Its pharmacological effect is based on increasing peripheral vascular tone through alpha-1 adrenergic receptor activation.
Potential pharmaceutical applications include:
The specific indication, formulation, dosage, and regulatory status should always be determined according to the applicable jurisdiction and approved product information.
The principal therapeutic relevance of Midodrine Hydrochloride comes from its ability to increase peripheral vascular tone. The conversion of midodrine to desglymidodrine provides the pharmacological basis for its alpha-1 adrenergic activity.
Because the compound directly influences vascular tone and blood pressure, pharmaceutical development requires appropriate control of identity, purity, assay, impurities, physical characteristics, and other applicable quality attributes.
Midodrine Hydrochloride is an important pharmaceutical raw material for manufacturers developing products containing midodrine as the active pharmaceutical ingredient.
API quality can influence the consistency, stability, manufacturability, and performance of finished pharmaceutical products. Consequently, appropriate analytical characterization and quality-control procedures should be applied throughout API handling and pharmaceutical production.
Typical quality evaluation may include:
Exact acceptance criteria should be established according to the applicable pharmacopoeial monograph, regulatory requirements, validated analytical methods, and the approved product specification.
Midodrine Hydrochloride should be evaluated using appropriate pharmaceutical quality-control procedures. Depending on the intended market and application, quality documentation may include:
Important: Do not publish a claim such as “IP/BP/EP/USP compliant” unless your actual batch/product specification has been demonstrated to comply with the relevant current monograph or standard.
FDA documentation describes Midodrine Hydrochloride as an odorless, white crystalline powder. It is soluble in water and sparingly soluble in methanol. The FDA record also reports a pH of 3.5–5.5 for a 5% aqueous solution, a pKa of approximately 7.8, and a melting range of 200–203°C.
These characteristics are useful for pharmaceutical identification, quality control, formulation development, and handling considerations.
Midodrine Hydrochloride should be stored according to the supplier's validated storage conditions and the applicable product specification.
Recommended general handling practices include:
For commercial API use, the approved product specification and stability data should take precedence over generic storage recommendations.
Midodrine Hydrochloride can be packaged according to customer requirements and applicable pharmaceutical handling practices.
Possible packaging configurations may include:
Actual packaging configuration, batch size, and quantity should be confirmed according to the product specification and customer requirements.
Midodrine Hydrochloride has an established pharmacological profile based on conversion to the active metabolite desglymidodrine and subsequent alpha-1 adrenergic receptor activation. This makes it relevant to pharmaceutical products intended to increase peripheral vascular tone and blood pressure in appropriate clinical settings.
For pharmaceutical businesses, reliable API quality is essential for consistent manufacturing and regulatory compliance. Appropriate analytical testing, documentation, storage, packaging, and traceability therefore form important parts of the Midodrine Hydrochloride API supply chain.
| Parameter | Specification |
|---|---|
| Appearance | White crystalline powder or crystals |
| Identification | IR & HPLC compliant |
| Assay (HPLC) | 98.0% – 102.0% |
| Loss on Drying | NMT 1.0% |
| Residue on Ignition | NMT 0.5% |
| Heavy Metals | NMT 10 ppm |
| pH (1% Solution) | 5.0 – 7.0 |
| Individual Impurity | NMT 0.5% |
| Total Impurities | NMT 1.0% |
| Water Content | NMT 1.0% |