When he began drinking alcohol, Patrick would drink two beers after work to feel relaxed. Six months later, Patrick needs to drink a six-pack of beer to feel the same level of relaxation. This illustrates:

drug tolerance

Explanation:

Drug tolerance -

It refers to the reduced affect or reaction of any drug , because of consumption of the daily basis or over consumption , is referred to as drug tolerance .

Over use of any drug makes the body resistive to the effect of the drug .

The drugs can be alcohol , smoking , etc.

The drug tolerance gives the extent of drug use .

Hence , from the given scenario of the question ,

The correct answer is drug tolerance .

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