according to the present invention , patients who suffer from migraine headaches can find relief therefrom by taking an effective amount of an antiestrogen for a period of time and sufficiently far in advance of the onset of the prodromal phase and / or aura phase so as to prevent the prodromal phase and / or aura phase from developing in the first place . the term “ patient ” as used herein means preferably a human being . in one embodiment , the patient is a man , especially a man having androgen deficiency and / or male menopause , whether the androgen deficiency and / or male menopause results naturally due to advancing age or from androgen deprivation therapy , for example , incident to a treatment for prostate cancer . in one especially preferred embodiment , the patient is a young man between the ages of 20 - 30 who is androgen deficient . in a second especially preferred embodiment , the patient is an older man at least 50 years of age who exhibits at least one symptom due to androgen deficiency and / or male menopause . in a third especially preferred embodiment , the patient is a man undergoing androgen deprivation therapy , for example , incident to a treatment for prostate cancer . see , for example , u . s . pat . no . 6 , 391 , 920 and u . s . pat . no . 7 , 067 , 557 , the entire contents of which are hereby incorporated herein by reference , for symptoms associated with androgen deficiency and / or male menopause and further teachings regarding androgen deficiency and / or male menopause . in one preferred embodiment , the patient is a migraine sufferer who has experienced migraine headaches involving a prodromal phase , and the inventive treatment prevents the development of the prodromal phase . in another preferred embodiment , the patient is a migraine sufferer who has experienced migraine headaches involving an aura phase , and the inventive treatment prevents the development of the aura phase . in an especially preferred embodiment , the patient is a migraine sufferer who has experienced migraine headaches involving both a prodromal phase and an aura phase , and the inventive treatment prevents the development of both the prodromal phase and the aura phase . the term “ antiestrogen ” as used herein means any compound that competes with estrogen for estrogen - receptor - binding sites and may delay replenishment of intracellular estrogen receptors . in a preferred embodiment , the antiestrogen is a selective estrogen receptor modulator ( serm ) and / or its analog , derivative , isomer , metabolite , pharmaceutically acceptable salt , pharmaceutical product , hydrate , n - oxide , or any combination thereof . in an especially preferred embodiment , the serms that are encompassed by the present invention include , but are not limited to the following embodiments : triphenylalkylenes such as triphenylethylenes , which include tamoxifen , droloxifene , toremifene , fispemifene , ospemifene , idoxifene , clomiphene , enclomiphene and zuclomiphene ; benzothiphene derivatives such as raloxifene and ly 353381 ; benzopyran derivatives such as em 800 ( sch 57050 ) and its metabolite em 652 ; naphthalene derivatives such as lasofoxifene ( cp 336 , 156 ); chromans such as levormeloxifene or their analogs , derivatives , isomers , or metabolites thereof , or their pharmaceutically acceptable salts , esters , n - oxides , or mixtures thereof . the term “ pharmaceutically acceptable salt ” as used herein means pharmaceutically acceptable acidic salts of the free base compound formed , where applicable , with inorganic and / or organic acids , as well as pharmaceutically acceptable basic salts of the free base compound formed , where applicable , with inorganic and / or organic bases . such pharmaceutically acceptable salts can be formed , for example , by reacting the free base compound with an amount of acid or base , such as an equivalent amount , in a medium such as one in which the salt precipitates or in an aqueous medium followed by lyophilization . exemplary “ pharmaceutically acceptable salts ” include , where applicable , and without limitation , alkali metal or alkaline earth metal salts , for example , sodium , potassium , calcium , magnesium or ammonium salts and the like , as well as acetates , ascorbates , benzoates , benzenesulfonates , bisulfates , borates , butyrates , citrates , camphorates , camphorsulfonates , fumarates , hydrochlorides , hydrobromides , hydroiodides , lactates , maleates , methanesulfonates , naphthalenesulfonates , nitrates , oxalates , phosphates , propionates , salicylates , succinates , sulfates , tartarates , thiocyanates , toluenesulfonates ( also known as tosylates ,) and the like . as the antiestrogen , particular preference is given to the use of tamoxifen , tamoxifen citrate , clomiphene , clomiphene citrate or toremifene , especially clomiphene citrate sold under the trademark clomid ®. clomid ® ( clomiphene citrate ) is a mixture of two geometric isomers [ cis ( zuclomiphene ) and trans ( enclomiphene )] containing between 30 % and 50 % of the cis - isomer . another useful composition is clomiphene citrate wherein the content of the cis isomer ranges from 0 - 29 % by weight of the total trans + cis isomer content in the composition and the content of the trans isomer ranges from 71 - 100 % by weight of the total trans + cis isomer content of the composition . these isomers may be separated and used completely free or substantially free (& lt ; 10 % by weight of the composition ) of one another . in a particularly preferred embodiment , the composition contains clomiphene citrate trans isomer completely free or substantially free (& lt ; 10 % by weight of the composition ) of cis isomer . the term “ effective amount ” as used herein means generally 5 to 1000 mg , preferably 10 to 100 mg , of the antiestrogen , when administered daily or every other day to avert the occurrence of migraines , particularly the onset of the prodromal phase and / or aura phase . the antiestrogens can be administered , e . g ., orally , parenterally or transdermally by a patch or by any other suitable route . preferably , the antiestrogens are administered orally . for the preferred oral administration route , suitable means are especially tablets , coated tablets , capsules , pills , suspensions , or solutions that can be produced in a way that is commonly used and familiar to persons skilled in the art , with the additives and vehicles that are commonly used for the formulation of antiestrogens that are to be administered orally . further exemplary formulation and administration details can be found in the above - identified patents that have already been incorporated by reference in their entireties . the pharmaceutical agent that is produced according to the invention contains as an active ingredient per dosage unit of the antiestrogen at a daily or every other day dosage of 5 to 100 mg in addition to the commonly used additives , vehicles and / or diluents or other antiestrogens at biologically equieffective dosages . for 10 mg tablets , for example , each tablet contains 15 . 2 mg of tamoxifen citrate which is equivalent to 10 mg of tamoxifen . for 20 mg tablets , each tablet contains 30 . 4 mg of tamoxifen citrate which is equivalent to 20 mg of tamoxifen . the inactive ingredients are carboxymethylcellulose calcium , magnesium stearate , mannitol and starch . commercially available clomiphene citrate tablets typically contain a mixture of two geometric isomers [ cis ( zuclomiphene ) and trans ( enclomiphene )] containing between 30 % and 50 % of the cis - isomer . a standard commercially available tablet contains 50 mg clomiphene citrate and the following inactive ingredients : corn starch , lactose , magnesium stearate , pregelatinized corn starch , and sucrose . the current tablets are used primarily for treating female infertility . treatment according to the present invention contemplates a redosing to accommodate the lower dosages specified herein . it is also contemplated that combinations of antiestrogens can be administered . the term “ for a period of time ” means at least once daily for a period of at least two days . preferably , the antiestrogen is administered at least once daily for a period of at least one week . in the most preferred embodiments , the antiestrogen is administered at least once daily for a period of at least one month , or at least one year or continuously for the remainder of the patient &# 39 ; s life . for periods of time greater than two days , the antiestrogen may be taken every other day providing this regiment is effective to prevent the start of the prodromal phase and / or aura phase . the term “ sufficiently far in advance ” means the antiestrogen is administered at least 6 hours or more in advance of the start of the prodromal phase or aura phase , preferably at least 12 hours or more in advance of the prodromal phase or aura phase , especially at least 24 hours , 48 hours , 72 hours or even longer in advance of the prodromal phase or aura phase . the administration of an effective amount of an antiestrogen to male migraine sufferers daily or every other day on a continuing basis for a period of time that is sufficiently far in advance of the onset of the prodromal phase or aura phase prevents the prodromal phase or aura phase from developing in the first place . as a result , the present invention prevents the development not only of the acute headache phase , but also of the undesirable mood changes , photophobia and phonophobia and other neurologic disturbances that characterize the prodromal and aura phases . while the present invention has been described in conjunction with the specific embodiments set forth above , many alternatives , modifications and other variations thereof will be apparent to those of ordinary skill in the art . all such alternatives , modifications and variations are intended to fall within the spirit and scope of the present invention .