HTR1A and Hypertension: Other hallucinogenic drugs, such as LSD, act by binding strongly to human serotonin (5-hydroxytryptamine (5-HT)) 5-HT1A, 5-HT2A, 5-HT2C, dopamine D2, and α2 adrenergic receptors and less strongly at α1 adrenergic receptors, D1, and D3 generating [76,77] arrhythmias, hypertension, heart rhythm disorders, severe hyperthermia, convulsions, visual disturbances, synesthesia, extreme mood disorders, depersonalization, disorders of perception of time and space.