If you have a diagnosis of SCA3 but are not symptomatic then I suggest buying and printing out these research reports and taking them to your doctor. Keep in mind this is only in animal research and very often what works in animals turns out to be less efficacious in humans. The flip side to that is the fact that this drug is cheap and already heavily prescribed for anxiety so human safety is well established.
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Citalopram Reduces Aggregation of ATXN3 in a YAC Transgenic Mouse Model of Machado-Joseph Disease.
ncbi.nlm.nih.gov/pubmed/301...
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Preclinical Evidence Supporting Early Initiation of Citalopram Treatment in Machado-Joseph Disease.