TiHKAL: Tryptamines I Have Known and Loved, the Continuation, combines memoir, botanical facts, chemistry, and drug-policy commentary

TiHKAL: The Continuation is Alexander and Ann Shulgin's 1997 sequel to PIHKAL, combining a continuing love story with travel, botanical information, scientific speculation, and psychological and political commentary. Its second book presents detailed descriptions of numerous tryptamines in the format used for PIHKAL, while appendices address cactus alkaloids, naturally occurring beta-carbolines, current drug law, and tryptamines identified in the literature that may be psychedelic. The work is presented as a standalone read as well as a sequel, and has been reprinted and translated into Spanish, German, and other languages. The supplied material identifies the authors, a foreword by Daniel M. Perrine, and publication details, but does not provide experimental findings or a comprehensive account of the individual compounds discussed.