S. Harvey, Depression, 16th ed.: Publication of University of Maryland Medical Center, 2013.
 S. D. Ehrlich. Herbal medicine. 2nd Edn., Publication of University of Maryland Medical Center. pp: 31, 2015.
 T. Hrenchir, 10 most-prescribed antidepressant medications, 21st ed.: Oxford University Press, 2015.
 D. McKenna, 10 top best selling botanicals: What they do, taking charge of your health & wellbeing. taking charge of your health & wellbeing vol. 16. University of Minnesota, 2015.
 C. Multum, "Cymbalta uses, dosage, side effects & warnings- Drugs.com. Drugs.com," vol. 96, 2015.
 T. R. Norman and O. S. James, Continuation treatment of major depressive disorder: Is there a case for duloxetine? Drug design, development and therapy, 1st ed.: Dove Medical Press, 2010.
 NCCIH, "NCCAM's 5 most searched-for herbs of 2012. NCCIH," vol. 71, p. 62, 2012.
 Health Day, "Taking St. John's wort for depression carries risks: Study-WebMD. No. 258. July 2015," 2015.
 M. S. Lee, M. A. Yong, C. Seockhoon, W. Richard, l. R. Joe, and S. K. Mun, "The effect of initial duloxetine dosing strategy on nausea in Korean patients with major depressive disorder," Psychiatry Investigation, vol. 9, pp. 391-399, 2012.
 C. Nordqvist, St. John's Wort: Uses, side effects, risks. Medical News Today, 4th ed.: MediLexicon, Intl, 2015.
 A. P. Peron, R. G. Mariucci, V. D. A. Igor, D. Elisângela, S. M. Mário, and E. P. V. Veronica, "Evaluation of the cytotoxicity, mutagenicity and anti-mutagenicity of a natural antidepressant, hypericum perforatum L. (St. John’s Wort), on vegetal and animal test systems," BMC Complementary and Alternative Medicine, vol. 16, p. 768, 2013.
 N. A. Qureshi and M. A. B. Abdullah, Mood disorders and complementary and alternative medicine: A literature review. Neuropsychiatric disease and treatment, 3rd ed.: Dove Medical Press, 2013.
 F. Firenzuoli and G. Luigi, Herbal medicine today: Clinical and research issues. Evidence-based complementary and alternative medicine: ECAM, 8th ed. Oxford University Press, 2007.
 M. Ekor, "The growing use of herbal medicines: Issues relating to adverse reactions and challenges in monitoring safety," Frontiers in Pharmacology. Frontiers Media S.A, vol. 24, p. 52, 2014.
 K. Morien, "Safety of St. John's Wort versus antidepressant drugs review. Herb world news online. Herb Research Foundation. No. 74," p. 369, 2003.
 L. McClure, A. Flower, and S. Price, "Scoping the evidence for the effectiveness of herbal medicines, EHTPA. No. 45," pp. 22-23, 2014.
 M. D. Linda, Chris, and E. D. Mary, "Cymbalta," Everyday Health, vol. 18, p. 45, 2014.
 D. J. M. Goldstein, Y. Y. Craig, and D. A. Mark, Duloxetine in the treatment of major depressive disorder: A double-blind clinical trial psychiatry.com, 1st ed.: Physicians Postgraduates, Inc, 2002.
 J. M. D. Moser, "St. John's Wort and duloxetine equally effective in mild to moderate depression," DocGuide. DocGuide.com. ECNP, vol. 24, p. 65, 2009.
This study received no specific financial support.
The author declares that there are no conflicts of interests regarding the publication of this paper.