Alpha-aminoamide derivatives useful as antimigraine agents

Use of an α-aminoamide of formula (I):

• wherein:
• A is a —(CH2)m— or —(CH2)n—X—, wherein m is 1 or 2;
• n is zero, 1 or 2;
• and X is —O—, —S— or —NH—;
• R is a furyl, thienyl, or pyridyl ring or a phenyl ring, unsubstituted or substituted by one or two substituents independently selected from halogen, hydroxy, C1-C4 alkyl,
• C1-C3 alkoxy and trifluoromethyl;
• R1 is hydrogen or C1-C3 alkyl;
• R2 is hydrogen or C1-C2 alkyl, unsubstituted or substituted by hydroxy or phenyl;
• phenyl, unsubstituted or substituted by one or two substituents independently selected from C1-C3 alkyl, halogen, hydroxy, C1-C2 alkoxy or trifluoromethyl;
• R3 is hydrogen or C1-C3 alkyl;
• if the case, either as a single isomer, or as a mixture thereof, or a pharmaceutically acceptable derivative thereof;
• in the manufacture of a medicament for the treatment of head pain conditions.