Efexor is a SNRI, not SSNI, right? Maybe that caused your search erros? The same information applies to SNRIs as SSRIs and if you do a search at the stop using keyword "SSRI" in the headings field you will find three pages of results.
Short answer: Wait at least a month.
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a1pha"Facts do not cease to exist because they are ignored." -A.Huxley