ドキサドシンメシル酸塩

Mechanism of Action

Benign Prostatic Hyperplasia (BPH)

The symptoms associated with benign prostatic hyperplasia (BPH), such as urinary frequency, nocturia, weak stream, hesitancy, and incomplete emptying are related to two components, anatomical (static) and functional (dynamic). The static component is related to an increase in prostate size caused, in part, by a proliferation of smooth muscle cells in the prostatic stroma. However, the severity of BPH symptoms and the degree of urethral obstruction do not correlate well with the size of the prostate. The dynamic component of BPH is associated with an increase in smooth muscle tone in the prostate and bladder neck. The degree of tone in this area is mediated by the alpha1 adrenoceptor, which is present in high density in the prostatic stroma, prostatic capsule and bladder neck. Blockade of the alpha1 receptor decreases urethral resistance and may relieve the obstruction and BPH symptoms and improve urine flow.

Hypertension

The mechanism of action of CARDURA is selective blockade of the alpha1 (postjunctional) subtype of adrenergic receptors. Studies in normal human subjects have shown that doxazosin competitively antagonized the pressor effects of phenylephrine (an alpha1 agonist) and the systolic pressor effect of norepinephrine. Doxazosin and prazosin have similar abilities to antagonize phenylephrine. The antihypertensive effect of CARDURA results from a decrease in systemic vascular resistance. The parent compound doxazosin is primarily responsible for the antihypertensive activity. The low plasma concentrations of known active and inactive metabolites of doxazosin (2-piperazinyl, 6'-and 7'-hydroxy and 6-and 7-O-desmethyl compounds) compared to parent drug indicate that the contribution of even the most potent compound (6'-hydroxy) to the antihypertensive effect of doxazosin in man is probably small. The 6'-and 7'-hydroxy metabolites have demonstrated antioxidant properties at concentrations of 5 μM, in vitro.

Indication

CARDURA is an alpha1 adrenergic antagonist indicated for:

• Signs and symptoms of Benign Prostatic Hyperplasia (BPH)
• Treatment of Hypertension

Dr. Reddy’sの専門知識・技術

ハイデラバード（インド）に本社を構えるDr. Reddy’s Laboratoriesは、世界的に有名な原薬（API）供給業者です。Dr. Reddy’sのAPIビジネスは米国、ヨーロッパ、ブラジル、南米、日本、中国、韓国、その他の新興市場において製薬会社の推奨パートナーとなっています。

Dr. Reddy’sのAPIビジネスは、ステロイド、ペプチド、複合長鎖分子、高薬理活性API（HPAPI /腫瘍学薬）など、複合APIの開発・製造において、30年以上にわたり高度な技術的実績を築き上げ、成長しています。この専門知識・技術は弊社の知的財産および規制関連業務の実績と共に、一貫して規制基準を満たし、それを超える優れた価値を生み出しています。Dr. Reddyの(-) API, R&D (研究開発)、IP、規制の高度な専門知識・技能の結果です。

顧客が真っ先に市場に参入するのに重要な要素は、機敏な供給網です。弊社は全施設を効率的に、そしてコストを最適化して稼働させ、品質と安全性、また、生産性の最新基準に従うことで、そうした供給網を実現させます。オフィスと工場の結びつきを強化し、ダイナミックな市場の変化に迅速に対応しています。そうした理由から、弊社は不足を解消して突発的な供給を満たすことができるのです。