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Stable pharmaceutical composition

  • US 4,857,552 A
  • Filed: 06/08/1988
  • Issued: 08/15/1989
  • Est. Priority Date: 06/08/1988
  • Status: Expired due to Fees
First Claim
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1. An injectable, aqueous pharmaceutical composition for the treatment of cardiac conditions comprising an effective amount of Methyl 3-[4-(2-hydroxy-3-isopropylamino)propoxy]phenylpropionate hydrochloride (esmolol) for treating such a cardiac condition, said composition comprising about 1 mg to about 250 mg of esmolol/mL of solution;

  • 0.01 to 0.04 M buffer;

    said composition having a pH range of about 4.5 to 5.5, the esmolol degrading in aqueous solution to produce 3-[4-(3-propionic acid)-phenoxy]-1-isopropylamino-2-propanol hydrochloride, said 3-[4-(3-propionic acid)-phenoxy]-1-isopropylamino-2-propanol hydrochloride having a pK in the pH range of said composition to thereby act as a secondary buffer to increase the buffer capacity without the addition of buffer and minimize the change in pH as degradation occurs, whereby the stability of esmolol in an aqueous composition is enhanced.

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