Here's a question I hope one of you guys can answer for me. How often can you take a triptan before you get a rebound? Just got a Rx for frovatriptan. Yes it's a pill, and yes it takes a while to work, but it also gives me 12- 24 hours without a fullblown ch. So anybody know?

There is no info in the medical literture on this question which I've seen.

It's too easy to confuse "rebound" with "recurrence" when using an abortive and individual experiences are barely suggestive that there is a problem.
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Rebound headaches. "Rebound Headaches--A Review", Au. John S. Warner, M.D., in HEADACHE QUARTERLY, 10:3(1999). (There is some confusion on the board about the meaning of "rebound". There appears to be an emerging consensus in the medical literature to define "rebound" as a headache which is caused by the overuse of any medication used to abort a headache or relieve pain. "Recurrence" [of a headache] is being used to refer to the redevelopment of an attack when its "normal" duration is longer than the useful life of the medication which has been taken. That is, the medication effectiveness is reducing before the headache has come to an end; the pain redevelops.)
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Sumatriptan has a hard initial punch and relatively short effective life--a combination which works well for most Cluster attacks. However, some people, whose Clusters have a longer life, find that the med is wearing down even as the pain continues. One can understand how this sequence comes into play: Attack, Imitrex injection, pain continues, it's a rebound cluster which has developed from the Imitrex.

This is one of the reasons that several other triptans were developed having less initial punch but longer effective life. While aimed at the migraine crowd, at first, a number of cluster users have found this characteristic of value to them.
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You may find the PDF file, below, will help you to understand the complexity of this issue.