The ornamental design for an anti-theft cap for a medicinebottle, as shown.
FIG. 1 is a front view of an anti-theft cap for a medicine bottle showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a right view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a perspective view thereof; and,
FIG. 8 is another perspective view thereof shown in a position of use attached to a bottle drawn in broken lines.
The dash-dash broken lines in FIG. 6 depict portions of the anti-theft cap for a medicine bottle that form no part of the claimed design. The dot-dot-dash broken lines in FIG. 8 illustrating a bottle depict environment and form no part of the claimed design.