The Boost(1988)

Lenny Brown moves to California to find his fortune in tax shelter investments. When the federal government changes the tax laws, poor Lenny finds himself $700,000 in hock with nowhere to turn. His friend, Joel, introduces him to cocaine to give Lenny that needed "boost". What ensues next is a descent into drug addiction and insanity as Lenny tries to regain control of his life, all the while needing that extra "boost".