While modest weight loss has been documented for both
medications, each carries risks of certain side effects. Sibutramine has been observed to increase blood pressure and pulse rate. In 2002, a consumer group claimed that the medication was related to the deaths of 19 people and filed a petition with the Department of Health and Human Services to ban the medication (Hilts, 2002). The sibutramine study by Berkowitz et al. (2003) noted elevated blood pressure as a side effect, and dosages had to be reduced or the medication discontinued in 19 of the 43 subjects in the first six months (p. 1809).
The main side effects associated with orlistat were abdominal discomfort, oily spotting, fecal incontinence, and nausea (Roche Laboratories, 2003, p. 13). More serious for long-term health is the concern that orlistat, being a fat-blocker, would affect absorption of fat-soluble vitamins, such as vitamin D. However, the study found that this side effect can be minimized or eliminated if patients take vitamin supplements two hours before or after administration of orlistat (p. 10). With close