Important Safety InformationLubiprostone is contraindicated in patients with known or suspected mechanical gastrointestinal obstruction. Patients with symptoms suggestive of mechanical gastrointestinal obstruction should be thoroughly evaluated by the treating healthcare provider to confirm the absence of such an obstruction prior to initiating lubiprostone treatment. The safety of lubiprostone in pregnancy has not been evaluated in humans. Lubiprostone should be used during pregnancy only if the benefit justifies the potential risk to the fetus. Women who could become pregnant should have a negative pregnancy test prior to beginning therapy with lubiprostone and should be capable of complying with effective contraceptive measures. Patients taking lubiprostone may experience nausea. If this occurs, concomitant administration of food with lubiprostone may reduce symptoms of nausea. Patients who experience severe nausea should inform their healthcare provider. Lubiprostone should not be prescribed to patients that have severe diarrhea. Patients should be aware of the possible occurrence of diarrhea during treatment and inform their healthcare provider if the diarrhea becomes severe. Patients taking lubiprostone may experience dyspnea within an hour of first dose. This symptom generally resolves within three hours, but may recur with repeat dosing. Patients who experience dyspnea should inform their healthcare provider. Some patients have discontinued therapy because of dyspnea. In clinical trials of lubiprostone (24 mcg twice daily vs. placebo; N=1113 vs. N=316) in patients with chronic idiopathic constipation (CIC), the most common adverse reactions (incidence > 4%) were nausea (29% vs. 3%), diarrhea (12% vs. <1%), headache (11% vs. 5%), abdominal pain (8% vs. 3%), abdominal distension (6% vs. 2%), and flatulence (6% vs. 2%). In clinical trials of lubiprostone (8 mcg twice daily vs. placebo; N=1011 vs. N=435) in patients with irritable bowel syndrome with constipation (IBS-C), the most common adverse reactions (incidence > 4%) were nausea (8% vs. 4%), diarrhea (7% vs. 4%), and abdominal pain (5% vs. 5%).