Which pack sizes are listed for Zomig 2.5 mg zolmitriptan tablets?

Zomig 2.5 mg zolmitriptan tablets are listed in packs of 3 (1 strip of 3), 6 (2 strips of 3), 12 (2 strips of 6 or 4 strips of 3), and 18 (6 strips of 3) tablets; not all pack sizes may be marketed.