Ali F, Rehman H, Babayan Z, Stapleton D, Joshi DD Energy drinks and their adverse health effects: A systematic review of the current evidence. Postgrad Med. 2015 Apr;127(3):308-22. doi: 10.1080/00325481.2015.1001712. Epub 2015 Jan 6. Review.
Burrows T, Pursey K, Neve M, Stanwell P What are the health implications associated with the consumption of energy drinks? A systematic review. Nutr Rev. 2013 Mar;71(3):135-48. doi: 10.1111/nure.12005. Epub 2013 Jan 29. Review.
Goldfarb M, Tellier C, Thanassoulis G Review of published cases of adverse cardiovascular events after ingestion of energy drinks. Am J Cardiol. 2014 Jan 1;113(1):168-72. doi: 10.1016/j.amjcard.2013.08.058. Epub 2013 Oct 4. Review.
Kurtz AM, Leong J, Anand M, Dargush AE, Shah SA Effects of caffeinated versus decaffeinated energy shots on blood pressure and heart rate in healthy young volunteers. Pharmacotherapy. 2013 Aug;33(8):779-86. doi: 10.1002/phar.1296. Epub 2013 May 30.
Phan JK, Shah SA Effect of caffeinated versus noncaffeinated energy drinks on central blood pressures. Pharmacotherapy. 2014 Jun;34(6):555-60. doi: 10.1002/phar.1419. Epub 2014 Mar 19.
Rath M Energy drinks: what is all the hype? The dangers of energy drink consumption. J Am Acad Nurse Pract. 2012 Feb;24(2):70-6. doi: 10.1111/j.1745-7599.2011.00689.x. Epub 2012 Jan 31. Review.
Shah SA, Nguyen NN, Bhattacharyya M Energy Implications of Consuming Caffeinated Versus Decaffeinated Energy Drinks. J Pharm Pract. 2015 Oct;28(5):482-3. doi: 10.1177/0897190015585738.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
