根據Roche,副作用在剛開始的時候最嚴重,且會隨著時間而降低副作用發生的頻率[16]。XENDOS study 發現使用此藥物的人只有36%會在第四年仍有腸胃道的副作用發生,而91%的人會在療程的第一年有至少一次的腸胃道副作用發生[12]。還有人提出,隨著時間的推移,副作用的減少可能與長期服用低脂飲食有關[17]。
在2010年的5月26日,美國食品藥品監督管理局(FDA) 批准了Xenical的修訂標籤,包括新增了”此藥物很少導致肝損傷”的安全信息[18]。
^{{Torgerson J, Hauptman J, Boldrin M, Sjöström L (2004). "XENical in the prevention of diabetes in obese subjects (XENDOS) study: a randomized study of orlistat as an adjunct to lifestyle changes for the prevention of type 2 diabetes in obese patients". Diabetes Care. 27 (1): 155–61. doi:10.2337/diacare.27.1.155.PMID 14693982}}
^ 11.011.1["Xenical Pharmacology, Pharmacokinetics, Studies, Metabolism". RxList.com. 2007. Archived from the original on 5 April 2007. Retrieved 16 March 2007.]
^ 12.012.1[Torgerson J, Hauptman J, Boldrin M, Sjöström L (2004). "XENical in the prevention of diabetes in obese subjects (XENDOS) study: a randomized study of orlistat as an adjunct to lifestyle changes for the prevention of type 2 diabetes in obese patients". Diabetes Care. 27 (1): 155–61. doi:10.2337/diacare.27.1.155. PMID 14693982.]
^ 13.013.1[Siebenhofer, A; Jeitler, K; Horvath, K; Berghold, A; Siering, U; Semlitsch, T (28 March 2013). "Long-term effects of weight-reducing drugs in hypertensive patients". The Cochrane Database of Systematic Reviews (3): CD007654. doi:10.1002/14651858.CD007654.pub3. PMID 23543553.]
^Davidson MH, Hauptman J, DiGirolamo M, et al. Weight control and risk factor reduction in obese subjects treated for 2 years with orlistat: a randomized controlled trial. JAMA. 1999, 281 (3): 235–42. PMID 9918478. doi:10.1001/jama.281.3.235.
^J. A. Menendez; L. Vellon; R. Lupu. Antitumoral actions of the anti-obesity drug orlistat (XenicalTM) in breast cancer cells: blockade of cell cycle progression, promotion of apoptotic cell death and PEA3-mediated transcriptional repression of Her2/neu (erbB-2) oncogene. Annals of Oncology. 2005, 16 (8): 1253–1267. PMID 15870086. doi:10.1093/annonc/mdi239.
^Garcia S, da Costa Barros L, Turatti A, Martinello F, Modiano P, Ribeiro-Silva A, de Oliveira Vespúcio M, Uyemura S. The anti-obesity agent Orlistat is associated to increase in colonic preneoplastic markers in rats treated with a chemical carcinogen. Cancer Lett. 2006, 240 (2): 221–4. PMID 16377080. doi:10.1016/j.canlet.2005.09.011.
^["myalli.com – frequently asked questions". GlaxoSmithKline. 2007. Archived from the original on 12 July 2007. Retrieved 18 August 2007.]
^[Parker-Pope, Tara. "Weighing the Pros and Cons Of New Fat-Blocking Drug Alli", The Wall Street Journal, 19 June 2007, pp. D1. Retrieved on 2007-08-18.]
^["Scheduling of orlistat" (Press release). Australian Therapeutic Goods Administration. 22 February 2007. Retrieved 3 March 2007.]
^["FDA Approves Orlistat for Over-the-Counter Use" (Press release). U.S. Food and Drug Administration (FDA). 7 February 2007. Retrieved 7 February 2007.]
^["Chemists to provide obesity pill". BBC News Online. 21 January 2009. Retrieved 22 January 2009.]
^[Clinical trial number NCT00940628 at ClinicalTrials.gov]
Boehm, Marcus F.; McClurg, Michael R.; Pathirana, Charles; Mangelsdorf, David; White, Steven K.; Hebert, Jonathan; Winn, David; Goldman, Mark E.; Heyman, Richard A. Synthesis of high specific activity tritium-labeled [3H]-9-cis-retinoic acid and its application for identifying retinoids with unusual binding properties. Journal of Medicinal Chemistry. 1994, 37 (3): 408–14. PMID 8308867. doi:10.1021/jm00029a013.
Hanessian, Stephen; Tehim, Ashok; Chen, Ping. Total synthesis of (-)-tetrahydrolipstatin. The Journal of Organic Chemistry. 1993, 58 (27): 7768. doi:10.1021/jo00079a022.
Peng-Yu, Yang; Kai, Liu; Hong Ngai, Mun; J.Lear, Martin; R.Wenk, Markus; S.Qin, Yao. Activity-based proteome profiling of potential cellular targets of Orlistat−an FDA-approved drug with anti-tumor activities. Journal of the American Chemical Society. 2010, 132 (2): 656. PMID 20028024. doi:10.1021/ja907716f.
Peng-Yu, Yang; Min, Wang; Kai, Liu; Omar, Sheriff; J.Lear, Martin; Siu Kwan, Sze; Cynthia Y., He; S.Qin, Yao. Parasite-based screening and proteome profiling reveal orlistat, an FDA-approved drug, as a potential anti Trypanosoma brucei agent. Chemistry-A European Journal. 2012, 18 (27): 8403. PMID 22674877. doi:10.1002/chem.201200482.