TABLE C-2 Summary of Estrogen and Progestin Contents of Oral Contraceptives Available in the United States, 50-μg Formulations

Brand Name a

Estrogen per Tablet (μg)

Total Estrogen (μg)

Progestin Type

Progestin per Tablet (mg)

Total Progestin (mg)

Approximate Norethindrone Equivalents b (mg)

Genora 1/50

50 c

1,050

Norethindrone

1.0

21.0

21.0

Norethin 1/50M

           

Norinyl 1+50

           

Ortho-Novum 1/50

           

Ovcon 50

50

1,050

Norethindrone

1.0

21.0

21.0

Norlestrin 1/50

50

1,050

Norethindrone acetate

1.0

21.0

21.0

Norlestrin 2.5/50

50

1,050

Norethindrone acetate

2.5

52.5

52.5

Demulen 1/50

50

1,050

Ethinodiol diacetate

1.0

21.0

21.0

Ovral d

50

1,050

Levonorgestrel

0.25

5.25

52.5-105

a Regimens of both 21 and 28 days are listed as the same formulation.

b Based on estimates of approximate progestin potencies (reviewed by Dorflinger, 1985).

c Contains Mestranol, which is metabolized to ethinyl estradiol. Mestranol is generally considered to be equivalent or slightly less potent than ethinyl estradiol.

d The total progestin content (norgestrel) is 0.5 mg; however, 50 percent is the inactive enantiomer dextronorgestrel.

TABLE C-3 Summary of Estrogen and Progestin Contents of Phasic Formulations of Oral Contraceptives Available in the United States

Brand Name

Estrogen per Tablet a (μg)

Total Estrogen (μg)

Progestin Type

Progestin per Tablet a (mg)

Total Progestin (mg)

Approximate Norethindrone Equivalents b (mg)

Ortho-Novum 7/7/7

35(21)

735

Norethindrone

0.5(7)

15.75

15.75

       

0.75(7)

   
       

1.0(7)

   

Tri-Norinyl

35(21)

735

Norethindrone

0.5(7)

15.0

15.0

       

1.0(9)

   
       

0.5(5)

   

Ortho-Novum 10/11

35(21)

735

Norethindrone

0.5(10)

16.0

16.0

       

1.0(11)

   

Tri-Levlen

30(6)

680

Levonorgestrel

0.50(6)

1.925

19.25-38.5

Triphasil

40(5)

   

0.075(5)

   
 

30(10)

   

0.125(10)

 

a Number of days at each dose.

b Based on estimates of approximate progestin potencies (Dorflinger, 1985).



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