A class of antidepressants called MAOIs (monoamine oxidase inhibitors) can increase the sensitivity to tyramine if taken orally. If sufficient quantities of tyramine are ingested, hypertensive crises may occur, potentially causing stroke or cardiac arrythmia.
All tap beer and ale should be avoided, as lack of hygiene and proper maintenance may allow tyramine-forming bacteria to grow.
http://en.wikipedia.org/wiki/List_of_foods_containing_tyramine
Alcoholic beverages - avoid Chianti wine and vermouth. Consumption of red, white, and port wine in quantities less than 120 mL present little risk (Anon, 1989; Da Prada et al, 1988; McCabe, 1986). Beer and ale should also be avoided (McCabe, 1986), however other investigators feel major domestic (US) brands of beer is safe in small quantities (1/2 cup or less than 120 mL) (Anon, 1989; Da Prada, 1988), but imported beer should not be consumed unless a specific brand is known to be safe. Whiskey and liqueurs such as Drambuie(R) and Chartreuse(R) have caused reactions. Nonalcoholic beverages (alcohol- free beer and wines) may contain tyramine and should be avoided (Anon, 1989; Stockley, 1993).
http://www.dr-bob.org/tips/maoi.html
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