A pharmaceutical composition comprising a peptide derivative or its pharmaceutical equivalent salt having a general formula, R
1
N═C(R
2
)-AA
1
-AA
2
-AA
3
-AA
4
-Y, in which R
1
is such as a hydrogen, R
2
is such as a methyl group, Y is such as a methylamino group, AA
1
is such as a tyrosine group, AA
2
is such as a D-arginine group, AA
3
is such as a phenylalanine group, and AA
4
is such as a N-methyllysine group has analgesic activity against a variety of pains on both subcutaneous and oral administration.
一种包括肽衍
生物或其药用等效盐的药物组合物,其具有一般式R1N═C(R2)-
AA1-
AA2-
AA3-
AA4-Y,其中R1为氢,R2为甲基基团,Y为甲基
氨基基团,
AA1为
酪氨酸基团,
AA2为
D-精氨酸基团,
AA3为苯丙
氨酸基团,
AA4为N-甲基赖
氨酸基团,在皮下和口服给药时对各种疼痛具有镇痛活性。