Could be known as Imigran in your part of the world.

Hoppy

Print the PDF file, below, and use it to discuss options with your doctor.

If this is available, I'd recommend giving it a try.
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Headache 2001 Sep;41(8):813-6 

Olanzapine as an Abortive Agent for Cluster Headache.


Rozen TD.
Department of Neurology, Jefferson Headache Center/Thomas Jefferson University Hospital, Philadelphia, Pa.

OBJECTIVE: To evaluate olanzapine as a cluster headache abortive agent in an open-label trial. BACKGROUND: Cluster headache is the most painful headache syndrome known. There are very few recognized abortive therapies for cluster headache and fewer for patients who have contraindications to vasoconstrictive drugs. METHODS: Olanzapine was given as an abortive agent to five patients with cluster headache in an open-label trial. THE INITIAL OLANZAPINE DOSE WAS 5 MG, AND THE DOSE WAS INCREASED TO 10 MG IF THERE WAS NO PAIN RELIEF. THE DOSAGE WAS DECREASED TO 2.5 MG IF THE 5-MG DOSE WAS EFFECTIVE BUT CAUSED ADVERSE EFFECTS. To be included in the study, each patient had to treat at least two attacks with either an effective dose or the highest tolerated dose. RESULTS: Five patients completed the investigation (four men, one woman; four with chronic cluster, one with episodic cluster). Olanzapine reduced cluster pain by at least 80% in four of five patients, and TWO PATIENTS BECAME HEADACHE-FREE AFTER TAKING THE DRUG. Olanzapine typically alleviated pain within 20 minutes after oral dosing and treatment response was consistent across multiple treated attacks. The only adverse event was sleepiness. CONCLUSIONS: Olanzapine appears to be a good abortive agent for cluster headache. IT ALLEVIATES PAIN QUICKLY AND HAS A CONSISTENT RESPONSE ACROSS MULTIPLE TREATED ATTACKS. IT APPEARS TO WORK IN BOTH EPISODIC AND CHRONIC CLUSTER HEADACHE.

PMID 11576207 PubMed

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Olanzapine has a brand name of "Zyprexa" and is a antipsychotic. Don't be put off by this primary usage. Several of the drugs used to treat CH are cross over applications, that is, drugs approved by the FDA for one purpose which are found to be effective with unrelated conditions--BJ.
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I am currently taken Depakine two pills daily + one pill of cipralex, can cipralex be a good replacement for ZYPREXA ?

Thanks Bob looks like a new hope.

Zyprexa works as a preventative like Verapamil and Lithium. It will take a week or two to kick in.

Hoppy

Olanzapine is not a preventive like Verap. although, as you will read below, in a few cases it apparently stopped Cluster completely.

Its used is as an abortive when you are having an attack. It works in about 20 minutes. As with all abortive meds, you use it when an attack is developing--and use it as the first sign of an attack.

Not used on a regular basis to prevent attacks.

I was on 5mg Zyprexa taken at bedtime for a number of years, and in all that time had no Spring or Autumn episodes, but because of weight gain my GP suggested I stop taking it which I did. That was a couple of months before Spring of 2012. Then come Spring as per normal the beast came a calling, back to my GP I went who then put me on Imigran  tablets, and the rests history. I'm now on the vitamin D regime and CH free.

Hoppy