Sometimes. Problem is tha clusters generaly are too frequent and long-lasting to respond to a triptian. There are geneally better treatments with an emphasis on prevention as much as possible.
Different headaches. Cluster headache and migraine headache are two differnt types of headache brought on by different mechanisms. Injectable sumatriptan has been shoown to be effective for some cluster headache patients.
Sometimes. Triptans are intended for migraines, but can be used for cluster headaches too.