The potion is called the Drink of Despair. Its effects are the same as the presence of a Dementor, apparently. Drinking the potion makes आप live again the worst memories आप may have. Besides, it seems to have a weakening side-effect on the body that ingests it.
In HBP, only Dumbledore drank of it. Harry was there to give it to him. He did not drink of it.
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thanks! :) well yeah i know harry didn't drink that.. i mean he was with him at the moment.