It makes no difference if the quantity consumed is less or more; liquor is absolutely Harām; whether pure or mixed. Thus even if a person licks a single drop it is Harām whether he gets intoxicated or not. In the same way if liquor is consumed by mixing it with other things, it is still Harām.
Allama Hilli (r.a.) has quoted an authentic tradition from Imam Ja’far as-Sadiq (a.s.), that he said:
“If more of it intoxicates, then to consume even a bit of it is Harām.”