Controlled absorption of admixed thyroid hormone formulations
First Claim
1. A pharmaceutical composition comprising levothyroxine (T4) or a derivative thereof and liothyronine (T3) or a derivative thereof in an admixture, wherein said admixture of T4 to T3 has a ratio which creates in vivo liothyronine serum levels at steady state or near steady state for an extended period of time.
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Accused Products
Abstract
The invention relates to admixtures of the thyroid hormones and derivatives thereof. These admixtures, particularly L-thyroxine (T4) and liothyronine (T3), produce steady state or near steady state serum levels of T3. When admixed in the appropriate ratio of T4 to T3, blood levels of T3 hormone are maintained at a steady state for an extended period of time independent of the need for control release excipients. The change in the kinetics of T3 absorption is controlled by the addition of T4 to T3.
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Citations
22 Claims
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1. A pharmaceutical composition comprising levothyroxine (T4) or a derivative thereof and liothyronine (T3) or a derivative thereof in an admixture, wherein said admixture of T4 to T3 has a ratio which creates in vivo liothyronine serum levels at steady state or near steady state for an extended period of time.
- 2. A pharmaceutical composition comprising levothyroxine (T4) or a derivative thereof and liothyronine (T3) or a derivative thereof in an admixture wherein said admixture ratio of T4 to T3 is less than 1.
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3. A pharmaceutical composition comprising levothyroxine (T4) or a derivative thereof and liothyronine (T3) or a derivative thereof in an admixture, wherein said admixture ratio of T4 to T3 is above 4.
- 15. A method of creating a steady state liothyronine concentration in vivo comprising administering an admixture of liothyronine or derivatives thereof and levothyroxine or derivatives thereof wherein said steady state is modulated by a ratio of levothyroxine to liothyronine and does not require other control release agents.
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18. A method of increasing the bioavailability of T4 and/or T3 comprising administering an admixture of liothyronine or derivatives thereof and levothyroxine or derivatives in a ratio of T4:
- T3 which is above 4;
1 or below 1;
1.
- T3 which is above 4;
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19. A method for treating a condition requiring the modulation of T3 and/or T4 comprising administering levothyroxine (T4) or a derivative thereof and liothyronine (T3) or a derivative thereof in a ratio of T4:
- T3 which is above 4;
1 or below 1;
1. - View Dependent Claims (20, 21, 22)
- T3 which is above 4;
Specification