Oxprenolol is a synthetic non-selective beta-adrenergic receptor antagonist belonging to the beta-blocker class. The active pharmaceutical ingredient is commonly handled in pharmaceutical manufacturing as Oxprenolol Hydrochloride, the hydrochloride salt of Oxprenolol. Oxprenolol is identified by CAS No. 6452-71-7, while Oxprenolol Hydrochloride is identified by CAS No. 6452-73-9. The free-base molecular formula is C₁₅H₂₃NO₃, with a molecular weight of approximately 265.35 g/mol. Oxprenolol Hydrochloride has the molecular formula C₁₅H₂₄ClNO₃ and molecular weight 301.81 g/mol.
Oxprenolol has pharmacological activity at both beta-1 and beta-2 adrenergic receptors. Unlike highly selective beta-1 blockers, oxprenolol is classified as a non-selective beta blocker and also possesses intrinsic sympathomimetic activity. It has historically been used in the management of cardiovascular conditions including hypertension, angina pectoris and cardiac arrhythmias. The National Library of Medicine's MeSH database also classifies oxprenolol as a beta-adrenergic antagonist used in hypertension, angina, arrhythmias and anxiety-related applications.
Oxprenolol is chemically described as (RS)-1-[2-(allyloxy)phenoxy]-3-(isopropylamino)propan-2-ol. The compound contains a secondary amino group, ether functionalities and a secondary alcohol group. FDA's Global Substance Registration System lists the free-base substance under UNII 519MXN9YZR with formula C₁₅H₂₃NO₃.
For pharmaceutical API manufacturing, Oxprenolol Hydrochloride is particularly important because the hydrochloride form provides the salt form used in established pharmaceutical specifications. USP identifies Oxprenolol Hydrochloride as 1-(o-allyloxyphenoxy)-3-isopropylamino-2-propanol hydrochloride, CAS 6452-73-9, with molecular weight 301.81 g/mol.
The current USP-NF monograph available for Oxprenolol Hydrochloride specifies a content of 98.5% to 101.0%, calculated on the dried basis. The monograph requires the material to be preserved in well-closed containers. A solution prepared by dissolving 1 g in 10 mL of water must be clear. Identification includes infrared spectroscopy and the chloride reaction.
The USP monograph specifies a pH of 4.0–6.0 in a 1-in-10 solution. Loss on drying is NMT 0.5%, determined after drying approximately 3 g under vacuum at 60°C for 6 hours. Residue on ignition is limited to NMT 0.1%. These numerical requirements are particularly useful when establishing a CMS specification section for pharmaceutical-grade Oxprenolol Hydrochloride API.
Oxprenolol Hydrochloride identification can be established through infrared spectroscopic identification together with confirmation of chloride. The USP chromatographic purity procedure uses thin-layer chromatography and establishes a comparison against Oxprenolol Hydrochloride reference material. No secondary spot from the test solution may exceed the specified reference intensity. The USP procedure uses a limit corresponding to 0.4% of the reference solution, representing approximately 0.2% related compounds because of the response-factor characteristics described in the monograph.
The pharmacopoeial assay is important to distinguish from an HPLC assay. Although a CMS field may be labelled “Assay (HPLC)”, the current USP-NF Oxprenolol Hydrochloride monograph performs the assay by potentiometric titration with 0.1 N perchloric acid. Each mL of 0.1 N perchloric acid is equivalent to 30.18 mg of C₁₅H₂₃NO₃·HCl. Therefore, the 98.5–101.0% value should not be incorrectly described as an HPLC-specific acceptance criterion.
Oxprenolol Hydrochloride is described as a white, crystalline powder. USP/NF solubility information describes it as freely soluble in alcohol, chloroform and water; sparingly soluble in acetone; and practically insoluble in ether.
The Japanese Pharmacopoeia monograph additionally reports a melting point of approximately 107–110°C for Oxprenolol Hydrochloride. It specifies a clear and colourless solution when 1 g is dissolved in 10 mL of water. Its Japanese Pharmacopoeia purity tests include heavy metals at NMT 10 ppm, arsenic at NMT 2 ppm, loss on drying at NMT 0.5%, and residue on ignition at NMT 0.1%.
Manufacturing pharmaceutical-grade Oxprenolol Hydrochloride requires controlled synthesis, purification, crystallization and drying operations followed by comprehensive analytical testing. Critical quality attributes include identity, assay, pH, moisture, inorganic residue, related substances, clarity of solution and physical characteristics.
A quality-focused API manufacturing process should use validated analytical methods and appropriate reference standards. Batch documentation may include a Certificate of Analysis, specification sheet, safety documentation, manufacturing information and relevant regulatory documentation according to the intended market.
Oxprenolol has historically been used as a cardiovascular beta blocker for conditions such as hypertension, angina pectoris and arrhythmias. Its pharmacological profile includes antagonism of beta-1 and beta-2 adrenergic receptors and intrinsic sympathomimetic activity.
Because Oxprenolol Hydrochloride is a pharmacologically active beta-blocker API, handling and manufacturing should be performed under appropriate pharmaceutical quality and occupational safety controls. Finished pharmaceutical applications must follow the approved formulation, dosage and regulatory requirements applicable to the market.
Consistent Oxprenolol Hydrochloride API quality is essential for reproducible pharmaceutical manufacturing. The current USP specification provides a clear quality framework, including 98.5–101.0% assay on dried basis, pH 4.0–6.0, loss on drying NMT 0.5%, residue on ignition NMT 0.1% and defined chromatographic purity requirements.
For pharmaceutical manufacturers, Oxprenolol API should therefore be evaluated against the applicable pharmacopoeial standard and approved product specification. Proper control of identity, potency, moisture, inorganic residue and related compounds helps support consistent raw-material quality and downstream formulation performance.
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| Parameter | Specification |
|---|---|
| Appearance | white to off-white crystalline powder |
| Identification | IR & HPLC compliant |
| Assay (HPLC) | 98.5% – 101.0% on dried basis |
| Loss on Drying | NMT 0.5% |
| Residue on Ignition | NMT 0.1% |
| Heavy Metals | NMT 10 ppm |
| pH (1% Solution) | 4.0 – 6.0 |
| Individual Impurity | NMT 0.2% |
| Melting Point | 107 – 110°C |