Flow My Tears, the Policeman Said

A famous musician/television show host suddenly finds his identity missing. He attempts to get a fake id and run from the law, but eventually gets apprehended. Once there, he meets the druggie incestuous sister of the police general. They both take a drug and find the world gradually return to normal. However, she ends up dead from an apparent overdose. It turns out that the drug causes a space-time continuum alteration in the world of everybody involved.

The book seems very dated within the early 70s culture, with tiring vulgar language, drugs and morality. He foresees a future of 3d tv, flying cars and video phones - yet still with LP records and the same big record companies and TV networks. Oops!

The premise is also fairly bizarre. A drug causes the taker to have an altered state of reality. However, this "altered state" is in fact "reality" to everybody else around. Thus, everybody else ends up perceiving the world the same way until the drug wears off (or in the case here - the user dies from the excessive strain of the drug.) This could get really strange if intersecting people started taking the drug.