This book presents current research in the study of pharmacology. Topics discussed include antidepressants therapy; monitoring antidepressant therapy by using heart rate variability; tianeptine and sertraline; gender differences in response to antidepressants; organotin polyethers as anticancer drugs; geldanamycin derivatives as promising anticancer drugs; design of novel anticancer drugs utilising busulfan for optimising pharmacological properties; advances in drug discovery to assess cholinergic neurotransmission; models of intestinal drug permeability and pharmacopoeial quality of antimicrobial and antiviral formations.