The invention relates to a capsule having a body in the form of a cup and a membrane lid, together defining a chamber containing a substance for the preparation of a drink. The body includes an outer substantially frusto conical side wall and a base integral with the outer side wall and closing said outer side wall at a rear end of the body. The membrane lid closes the other end of the outer side wall. The base is formed by a peripheral region defining the rear end of the body and by a central region extending into the capsule in relation to the rear end, defining a recess outside the body. The central region includes at least one weakened area which is intended to break at least partially under the pressure of a pressurized liquid.
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