Lysergic acid diethylamide stimulates cardiac human H2 histamine and cardiac human 5-HT4-serotonin receptors

Naunyn Schmiedebergs Arch Pharmacol. 2024 Jan;397(1):221-236. doi: 10.1007/s00210-023-02591-6. Epub 2023 Jul 4.


Lysergic acid diethylamide (LSD) is an artificial hallucinogenic drug. Thus, we hypothesized that LSD might act 5-HT4 serotonin receptors and/or H2 histamine receptors. We studied isolated electrically stimulated left atrial preparations, spontaneously beating right atrial preparations, and spontaneously beating Langendorff-perfused hearts from transgenic mice with cardiomyocyte-specific overexpression of the human 5-HT4 receptor (5-HT4-TG) or of the H2-histamine receptor (H2-TG). For comparison, we used wild type littermate mice (WT). Finally, we measured isometric force of contraction in isolated electrically stimulated muscle strips from the human right atrium obtained from patients during bypass surgery. LSD (up to 10 µM) concentration dependently increased force of contraction and beating rate in left or right atrial preparations from 5-HT4-TG (n = 6, p < 0.05) in 5-HT4-TG atrial preparations. The inotropic and chronotropic effects of LSD were antagonized by 10 µM tropisetron in 5-HT4-TG. In contrast, LSD (10 µM) increased force of contraction and beating rate in left or right atrial preparations, from H2-TG. After pre-stimulation with cilostamide (1 µM), LSD (10 µM) increased force of contraction in human atrial preparations (n = 6, p < 0.05). The contractile effects of LSD in human atrial preparations could be antagonized by 10 µM cimetidine and 1 µM GR 125487. LSD leads to H2-histamine receptor and 5-HT4-receptor mediated cardiac effects in humans.

Keywords: Chronotropy; H2-histamine receptor; Heart; Inotropy; Lysergic acid diethylamide.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Heart Atria
  • Histamine / pharmacology
  • Humans
  • Lysergic Acid Diethylamide* / pharmacology
  • Mice
  • Mice, Transgenic
  • Myocardial Contraction
  • Receptors, Histamine
  • Receptors, Histamine H2 / genetics
  • Receptors, Serotonin
  • Receptors, Serotonin, 5-HT4 / genetics
  • Serotonin* / pharmacology


  • Serotonin
  • Lysergic Acid Diethylamide
  • Histamine
  • Receptors, Serotonin, 5-HT4
  • Receptors, Serotonin
  • Receptors, Histamine
  • Receptors, Histamine H2