The acute Porphyrias are examples of toxico-genetic diseases and disea
ses genetically acquired, which show an idiosyncratic reaction to cert
ain chemicals and drugs. Porphyrics are at risk of developing an acute
attack if exposed to various precipitating factors of which drugs are
the most common factor. This paper presents lists of drugs complied i
nto those hazardous for patients with acute porphyria and those though
t to be safe.