Just follow the otherwise-empty arrow:
This is just the silliest drug packaging, there's literally nothing in that arrow and two (!) tablets come in the box. pic.twitter.com/B5MJf3xabP
— Signe Dean (@nevertoocurious) October 24, 2017
A box of two? Wow.
Wikipedia semi-helpfully points out that “[i]n the United States, it is available only by medical prescription (and is frequently limited, without prior authorization, to a quantity of nine in a 30-day period).” A quantity of nine, per Drugs.com, runs $92.52. To someone with a migraine, a condition for which this drug is indicated, ten bucks and change for a single tab is probably worth it. Maybe the two-tab version is intended to get you through a particularly bad weekend.