Hi, I'd like to help you with your question.
According to the side effects listed for Imipramine, there is no evidence that it causes clubbing of the fingers. However, every person is different in how they react to medication so you need to check with the doctor who prescribed your medication to be sure. If you feel that you are having a bad reaction to the medication, your doctor can take you off Imipramine and place you on another medication.
I hope this helped you,
I appreciate the other experts confirmation of my answer.