There must have the alcohol prohibited all the persons who have chronic illnesses of the liver, of the pancreas, of the nervous system, psychiatric disorders, those that take certain medicines (it is specified usually in the brochure of the medicine), before leading or before there handle potentially dangerous machines and all the minors of age.

Out of this, a person can drink, if it is accustomed, a daily alcohol dose without long-term harmful effects existing; the dose is very variable from a few persons to others and it depends on the sex, weight, age and, probably, on genetic factors. In general there are considered to be a sure dose below 30 grams of alcohol a day, of risk moderated between 30 and 60 daily grams of alcohol and of high risk (for the cirrhosis development) more than 60 daily grams of alcohol. The grams are calculated multiplying the graduation of the drink, which there are the grams of alcohol for every 100cc, by the quantity; for example, a bottle (750 cc) of a red wine (12 grams %) 750 will usually have x 12 / 100 = 90 grams; 4 canes (of 250 cc) of current beer (5 %) will have 4 x 250 x 5 / 100 = 50 grams; 2 glasses (of 125 cc) of whisky (40 %) will have 100 grams of alcohol...