Can I Take Laxatives When Pregnant?

Constipation is one of the most common and uncomfortable symptoms of early pregnancy. Progesterone slows down the digestive system, iron supplements add to the problem, and a growing uterus puts pressure on the bowel. If you're struggling and wondering whether laxatives are safe, here's a clear guide to what's available and what to avoid during pregnancy.

Quick Answer

Laxatives in pregnancy: Some laxatives are considered safe in pregnancy. Bulk-forming laxatives such as Fybogel (ispaghula husk) and osmotic laxatives such as lactulose are generally the first options recommended. Stimulant laxatives like senna should be avoided unless your GP specifically recommends them, particularly in the third trimester. Always check with your GP or pharmacist before starting any laxative.

Types of Laxatives and Which Are Safer in Pregnancy

Bulk-forming laxatives (such as Fybogel/ispaghula husk, or Movicol's fibre equivalent) work by absorbing water and adding bulk to stools, helping them pass more easily. These are generally considered the safest starting point in pregnancy because they work mechanically rather than chemically and are not significantly absorbed into the body. They do require you to drink plenty of water to be effective.

Osmotic laxatives (such as lactulose or macrogol/Movicol) draw water into the bowel to soften stools. Lactulose is commonly used in pregnancy and is generally considered low-risk. Macrogol (Movicol) is also used, though it is worth confirming the dose with your pharmacist or GP.

Stimulant laxatives (such as senna, bisacodyl, or Dulcolax) cause the bowel to contract more forcefully. The NHS advises that stimulant laxatives should generally be avoided in pregnancy, particularly in the first trimester and in late pregnancy, unless specifically recommended by a healthcare professional. Senna, in particular, should only be used short-term and under guidance.

Suppositories and enemas are sometimes used for more severe constipation. These should only be used on the advice of your GP or midwife during pregnancy.

Always consult your GP, midwife, or pharmacist before taking any laxative during pregnancy. What works and is safe can depend on how far along you are, whether you have any underlying health conditions, and what other medications you are taking.

Why Constipation Is So Common in Pregnancy

• Progesterone — the hormone that supports early pregnancy also relaxes smooth muscle throughout the body, including in the bowel wall, slowing transit time
• Iron supplements — prescribed iron tablets are a significant cause of constipation and hard stools for many pregnant women
• Reduced physical activity — particularly in early pregnancy when fatigue and nausea can limit movement
• Dehydration — nausea and vomiting can reduce fluid intake, making stools harder
• Diet changes — aversions to fruit, vegetables, or high-fibre foods are common in the first trimester

Dietary and Lifestyle Steps to Try First

• Increase fibre gradually — fruit (especially prunes, kiwi, and pears), vegetables, wholegrains, and legumes all support bowel function
• Drink more water — aim for at least six to eight glasses a day; dehydration is a key driver of constipation
• Gentle movement — regular walks, swimming, or prenatal yoga can stimulate the bowel
• Warm drinks in the morning — a warm glass of water or herbal tea on waking can help trigger a bowel movement
• Don't ignore the urge — respond to the urge to go promptly; ignoring it repeatedly can make constipation worse

If these measures haven't helped after a few days, speaking to your pharmacist about a bulk-forming or osmotic laxative is a sensible next step.

NHS Guidance

Frequently Asked Questions

Don't panic. Taking a small amount of most over-the-counter laxatives before you knew you were pregnant is unlikely to cause harm. Contact your GP or midwife for reassurance and mention it at your booking appointment. Your care team will want to know, but in most cases there is no cause for concern.

Can I buy laxatives over the counter while pregnant?

Some laxatives, such as Fybogel and lactulose, are available over the counter. Always tell the pharmacist you're pregnant before buying any medication. They can confirm which product is appropriate for your stage of pregnancy, advise on the correct dose, and suggest alternatives if needed. Avoid self-selecting stimulant laxatives without guidance.

Is it safe to take laxatives throughout my whole pregnancy?

This depends on the type. Bulk-forming laxatives are generally used as needed rather than continuously. Long-term or regular use of any laxative during pregnancy is something to discuss with your GP, who can also rule out other causes and ensure your bowel health is monitored.

Always speak to your midwife or GP for personal advice about managing constipation in pregnancy.

This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Last reviewed: June 2026

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• Pregnancy Vitamins
• Foods to Avoid in Pregnancy