The sumatriptan 6 milligram injectors only last me 2 hours, then the attack returns. The 100 milligram sumatriptan succinate pills keep the CH away for 6 to 12 hours. The injectors work really fast and abort the CH in 1 to 20 minutes. The pills take 20 minutes to an hour and a half to work. If i had to choose between the pills or shots, I'd take the pills. The relief is longer with the pills.