Osbourne said in a statement released Tuesday that his doctor advised him to delay the tour, which was to have begun Oct. 22 in Dublin. The former Black Sabbath lead singer said the tremors were “practically destroying my life along with my self-esteem.”

“I was no longer comfortable being around people, which, as you can imagine, is not the best trait for a performer,” the 54-year-old said.

Osbourne’s doctor, Allan Ropper, said a side effect of the medication was dry mouth, which impairs the voice. He added that the problem would subside in about a month.

The European tour will start in January at the earliest, according to the statement.

“I feel like I keep letting you all down, which breaks my heart, but you have my word that I will be over in the new year to complete my European tour,” the singer said.

Osbourne and his family have enjoyed a higher profile since they opened up their home life for the hit MTV reality series “The Osbournes,” now in its third season.