Actress Bipasha Basu, who was recently taken to a hospital after suffering exhaustion and viral fever, is back to work. She has begun working on "Aatma".

However, she feels it will take a while before she can work full throttle.

"Today (Monday) I started shooting for 'Aatma' again. Still not got my usual energy back! Need to take it easy for a few days and spring back to work post that, " the 33-year-old tweeted.

"Aatma", directed by Suparn Verma, stars Nawazuddin Siddiqui opposite Bipasha.