I became pregnant while taking tirzepatide (Mounjaro); how should I manage my diabetes during pregnancy?

Management of Pregnancy After Conceiving on Tirzepatide

Discontinue tirzepatide immediately and transition to insulin therapy for diabetes management during pregnancy. 1

Immediate Actions

Discontinue Tirzepatide

• Stop tirzepatide as soon as pregnancy is confirmed - the FDA label explicitly states "It is not known if MOUNJARO will harm your unborn baby" and advises patients to "tell your healthcare provider if you become pregnant while using MOUNJARO." 1
• Animal studies showed fetal growth reductions and abnormalities at clinically relevant exposures, with effects including external, visceral, and skeletal malformations in rats and reduced fetal weights in rabbits. 1
• There is insufficient data on tirzepatide use in pregnant women to evaluate drug-related risks of major birth defects, miscarriage, or other adverse outcomes. 1

Transition to Insulin Therapy

• Insulin is the first-line pharmacological therapy for all women with preexisting diabetes during pregnancy. 2, 3
• Both insulin injections and insulin pump therapy are effective approaches for achieving glycemic control. 3
• Consider reducing doses of any concomitantly administered insulin secretagogues (sulfonylureas) when initiating new therapy to reduce hypoglycemia risk. 1

Glycemic Targets During Pregnancy

Strict Blood Glucose Goals

• Target fasting glucose: 60-105 mg/dL (3.3-5.8 mmol/L) 4
• Target postprandial glucose: <120 mg/dL (6.7 mmol/L) 4
• Target HbA1c: <6.0% during pregnancy (preconception goal <6.5%) 3
• Implement self-monitoring of blood glucose levels four or more times daily to guide insulin and dietary modifications. 4

Advanced Monitoring Options

• Continuous glucose monitoring (CGM) can improve glycemic control and neonatal outcomes in women with type 1 diabetes and should be considered for intensive management. 2, 3

Comprehensive Diabetes Care During Pregnancy

Screening for Complications

• Dilated eye examinations: Perform ideally before pregnancy, in the first trimester, then every trimester and for 1 year postpartum due to risk of diabetic retinopathy progression. 2
• Renal function monitoring: Check serum creatinine and urine albumin-to-creatinine ratio, with ongoing monitoring for nephropathy. 2, 3
• Cardiovascular assessment: ECG in individuals ≥35 years with cardiac signs, symptoms, or risk factors. 2
• Screen for obstructive sleep apnea if obesity is present, as it is often undiagnosed and associated with poor outcomes. 3

Medication Review

• Discontinue medications unsafe in pregnancy: Stop ACE inhibitors, ARBs, and statins immediately if currently prescribed. 3
• Review all prescription and nonprescription medications, herbal supplements, and nonherbal supplements. 2

Nutritional and Lifestyle Management

• Comprehensive nutrition assessment with meal planning focused on avoiding postprandial hyperglycemia. 2, 5
• Calorie restriction with low glycemic index diet to reduce insulin resistance. 5
• Regular moderate exercise as tolerated. 2
• Prenatal vitamins with 400-800 mcg folic acid and 150 mcg potassium iodide. 2

Risk Mitigation Strategies

Hypoglycemia Prevention

• Glucagon should be available to the patient and close contacts should be trained in its use, as rates of severe hypoglycemia increase during pregnancy. 3
• Monitor for hypoglycemia unawareness and adjust insulin regimens accordingly. 2

Preeclampsia Prevention

• Low-dose aspirin is recommended soon after 12 weeks' gestation to minimize the risk of preeclampsia. 3

Monitoring for Diabetic Ketoacidosis

• Monitor for signs of DKA, which poses increased risk during pregnancy. 2
• Check for ketonuria during follow-up visits. 5

Important Caveats

Contraception Considerations

• Note that tirzepatide may have reduced the effectiveness of oral contraceptives during use - the FDA label recommends switching to non-oral contraceptive methods or adding barrier methods for 4 weeks after initiation and dose escalations. 1
• This delayed gastric emptying effect may have contributed to contraceptive failure. 1

Postpartum Planning

• Discuss long-acting reversible contraception before and after delivery to allow for appropriate preconception planning for future pregnancies. 3
• Women with gestational or preexisting diabetes have increased lifetime risk of type 2 diabetes, cardiovascular disease, and metabolic syndrome requiring long-term follow-up. 5