Showtime’s drama pilot “Possible Side Effects,” nabbed Ellen Burstyn has joined the cast. The plot is set inside the world of the pharmaceutical industry.

Burstyn is set to play the matriarch of the Hunt family, a powerful but dysfunctional brood that runs a drug company that gets into a heap of trouble – must be straight from the headlines. Josh Lucas is already attached to star, as is Tim Blake Nelson.

Tim Robbins is writing and directing “Possible Side Effects.”