Treatment of Constipation in Pregnancy

Non-Pharmacological Interventions

Increase dietary fiber to approximately 30 g/day through fruits, vegetables, whole grains, and legumes, as recommended by the American Gastroenterological Association 1
Aim for 3-4 servings of fruits and 3-4 servings of vegetables daily to help alleviate constipation symptoms 2
Ensure adequate fluid intake, particularly water, to soften stools and make them easier to pass 2, 3

Polyethylene glycol (PEG) 17g daily is a preferred first-line pharmacological therapy for constipation during pregnancy, according to the American Gastroenterological Association 1, 2
Lactulose is also safe but may cause more bloating than PEG, and its use should be considered on a case-by-case basis 1, 2
Magnesium hydroxide 400-500 mg daily is considered safe and effective for constipation relief during pregnancy 3

Glycerin suppository may be considered for immediate relief if a patient is severely uncomfortable, as recommended by Praxis Medical Insights 3
Hydrocortisone foam has been shown to be safe in the third trimester for symptomatic relief of associated hemorrhoids 2, 3

Severe dehydration or inability to tolerate oral intake requires hospitalization for IV fluid replacement, as recommended by Praxis Medical Insights 4
Implement anticoagulant thromboprophylaxis during hospital stay to prevent complications 3

Avoid using bulk laxatives (psyllium) for opioid-induced constipation, as recommended by the Annals of Oncology 5
Magnesium and sulfate salts can lead to hypermagnesemia and should be used cautiously in renal impairment, according to the Annals of Oncology 5
Enemas are contraindicated in patients with recent colorectal/gynecological surgery, recent anal trauma, or recent pelvic radiotherapy, as recommended by the Annals of Oncology 5

Reassess bowel movement frequency and consistency after initiating treatment, with a goal of achieving soft, formed stools every 1-2 days, as recommended by Praxis Medical Insights 3
Adjust treatment based on response, escalating through the algorithm as needed, to ensure effective constipation management 3

Lactulose 15 mL (≈10 g) twice daily is recommended as the next‑line osmotic laxative when polyethylene glycol (PEG) is ineffective; it is considered safe throughout all trimesters of pregnancy. – American Gastroenterological Association (AGA) 2024 guideline, strong recommendation. 6
In the second and third trimesters, short‑term use of stimulant laxatives such as bisacodyl or sodium picosulfate may be added for refractory constipation. – American Association for the Study of Liver Diseases (AASLD) hepatology guideline, moderate‑quality evidence. 7

A daily dietary fiber intake of about 30 g (from fruits, vegetables, whole grains, legumes) should be confirmed before escalating pharmacologic therapy. – AGA 2024 guideline. 6
Adequate fluid intake, especially water, should be ensured to support bowel regularity. – AGA 2024 guideline. 6

The AGA 2024 guideline endorses lactulose as the preferred alternative after PEG failure, citing high‑quality guideline summaries. – Strong recommendation based on comprehensive evidence synthesis. 6
The AASLD 2021 hepatology guideline supports the conditional use of stimulant laxatives in later pregnancy, noting moderate‑quality evidence due to limited pregnancy‑specific data. – Moderate recommendation. 7