Ozempic Diarrhea: When to Call the Doctor

How often does Ozempic cause diarrhea?

In the Ozempic label's pooled placebo-controlled trials (262 people on placebo, 260 on 0.5 mg and 261 on 1 mg; mean Ozempic exposure 32.9 weeks), diarrhea occurred in 1.9%, 8.5% and 8.8% respectively [1]. Diarrhea sits in the label's list of most common adverse reactions, alongside nausea, vomiting, abdominal pain and constipation [1].

GI reactions as a group are much more common than diarrhea alone: 15.3% on placebo, 32.7% on 0.5 mg and 36.4% on 1 mg [1]. Severe GI reactions were reported in 0%, 0.4% and 0.8% [1]. Treatment was stopped for GI reasons by 0.4%, 3.1% and 3.8% [1].

At the top of the dose range, a 40-week trial of 959 patients compared 2 mg with 1 mg: GI reactions occurred in 34% on 2 mg versus 30.8% on 1 mg, and the label reports no new safety signals from that trial [1].

When does it usually happen?

Most reports of nausea, vomiting and/or diarrhea occurred while the dose was being increased [1]. Ozempic starts at 0.25 mg once weekly for 4 weeks, then 0.5 mg, rising to 1 mg and then 2 mg only if more glycemic control is needed and only after at least 4 weeks at the previous dose [1].

Which symptoms does the label treat as warning signs?

The Ozempic label sets no stool count and no number of days that marks a problem. The reactions it warns about are fluid loss severe enough to affect the kidneys, and pancreatitis [1].

Fluid loss and kidney injury

Postmarketing reports describe acute kidney injury, in some cases requiring hemodialysis, in people taking semaglutide, and most of those events occurred in patients who had GI reactions causing dehydration such as nausea, vomiting or diarrhea [1]. The label says to monitor renal function in patients reporting reactions that could lead to volume depletion, especially during initiation and escalation of Ozempic [1]. It recommends no dose adjustment for renal impairment [1].

Persistent or severe abdominal pain

The pancreatitis warning describes persistent or severe abdominal pain, sometimes radiating to the back, which may or may not be accompanied by nausea or vomiting [1]. The label says to discontinue Ozempic and initiate appropriate management if pancreatitis is suspected [1]. Acute and necrotizing pancreatitis, sometimes fatal, appear among the label's postmarketing reports [1].

Severe GI reactions and gallbladder problems

The label warns that GI reactions with Ozempic can be severe, at the rates above [1]. It also says that if cholelithiasis (gallstones) or cholecystitis is suspected, gallbladder studies are indicated [1].