Constipation: What You Can Get at the Pharmacy Without a GP

What counts as constipation?

Clinically, constipation is defined as having fewer than three bowel movements per week, or passing stools that are hard, dry, lumpy, and difficult or painful to expel. It is important to note that “normal” bowel habit varies considerably between individuals — some people open their bowels three times a day, while others do so only three times a week, and both can be entirely normal. Constipation is therefore about a change from your own usual pattern, as much as about any fixed frequency.

There are many common causes. A diet low in fibre, inadequate fluid intake, and a sedentary lifestyle are the most frequent culprits. Certain medicines — particularly opioid painkillers, iron supplements, and some antacids — are well-known to cause or worsen constipation as a side effect. Irritable bowel syndrome (IBS) frequently involves constipation as a predominant symptom. Constipation treatment in Medway is something our pharmacists at Medway Pharmacy in Gillingham deal with regularly, and in many cases the right advice and the right laxative from the pharmacy shelf are all that is needed to resolve the problem.

Pregnancy is another very common cause — the hormonal changes that relax the muscles of the gut, combined with the physical pressure of a growing uterus, slow bowel transit considerably. Temporary changes to diet and routine — such as travelling, illness, or starting a new medication — can also trigger a short episode of constipation. Understanding the likely cause helps guide the most appropriate treatment.

What types of laxatives are available at the pharmacy?

There are four main classes of laxatives, and Medway Pharmacy in Gillingham stocks all of them. Each works through a different mechanism, and the best choice depends on the nature and duration of your constipation as well as any other medicines you take.

Bulk-forming laxatives — such as ispaghula husk (sold as Fybogel) — are generally considered the safest first-line option for most people, including those who need laxatives on a longer-term basis. They work by absorbing water in the gut to form a soft, bulky stool that is easier to pass. They typically take two to three days to produce a full effect, and it is essential to drink plenty of water alongside them, otherwise they can worsen blockage.

Osmotic laxatives — including macrogol (Movicol) and lactulose — draw water into the bowel from the surrounding tissues, softening and loosening the stool. Macrogol is generally preferred over lactulose, as lactulose can cause significant bloating and wind in some people. Osmotic laxatives are suitable for both short and longer-term use.

Stimulant laxatives — such as senna and bisacodyl — cause the muscles of the bowel wall to contract more forcefully, speeding up transit. They typically act within six to twelve hours and are particularly useful for short-term relief. They are not recommended for long-term regular use without medical supervision.

Stool softeners — such as docusate — allow water and fats to penetrate the stool to soften it. They are less commonly recommended as standalone treatment and are generally most effective when combined with a stimulant laxative. Our pharmacists can advise on which product or combination is most appropriate for your situation.

What lifestyle changes help with constipation?

For many people, constipation can be improved significantly — or prevented altogether — with straightforward changes to diet and routine. The NHS recommends aiming for around 30 grams of dietary fibre per day, which can be achieved by eating more fruit, vegetables, pulses, and wholegrains such as wholemeal bread, brown rice, and oats. Increasing fibre too rapidly can initially cause bloating, so it is sensible to make gradual increases over a few weeks and allow the gut to adjust.

Adequate fluid intake is equally important. Aim for six to eight glasses of water or other non-caffeinated, non-alcoholic fluid per day. Fibre draws water into the stool as it passes through the bowel — without enough fluid, a high-fibre diet can paradoxically make constipation worse. Regular physical activity also helps, as movement stimulates the natural contractions that move stool through the colon.

Two simple but often overlooked habits can make a real difference. First, do not ignore the urge to defecate — suppressing the natural reflex repeatedly causes the bowel to become less responsive over time. Second, consider your toilet posture. Raising your feet on a small footstool while seated on the toilet places the lower bowel in a more natural squatting position, which reduces the effort needed to pass a stool. For patients in the Medway and Gillingham area who are managing mild, intermittent constipation, these lifestyle measures are often enough to restore normal bowel habit without any laxatives at all.

Can I get constipation treatment for children or during pregnancy?

Constipation in children is extremely common, particularly during toilet training, after illness, or when dietary habits change. Lactulose is widely used in children and is considered safe across a broad age range. Macrogol in a paediatric formulation — sold as Movicol Paediatric — is now the preferred first-line treatment for childhood constipation according to NICE guidelines, and is available over the counter from Medway Pharmacy in Gillingham. It is effective, well tolerated, and can be mixed into drinks to make it easier to give to young children. Stimulant laxatives such as senna can be used in children, but are generally reserved for cases where osmotic laxatives alone have not been sufficient, and always with appropriate dosing guidance.

During pregnancy, constipation is one of the most common gastrointestinal complaints, affecting a significant proportion of women at some point. Bulk-forming laxatives such as ispaghula husk are considered the safest first choice in pregnancy, as they are not absorbed systemically. Lactulose is also regarded as safe to use throughout pregnancy. Macrogol is often used in practice, although the evidence base in pregnancy is smaller than for bulk-forming laxatives. Stimulant laxatives such as senna and bisacodyl are generally avoided during pregnancy, particularly in the first trimester, unless specifically recommended by a healthcare professional. If you are pregnant and struggling with constipation, our pharmacists at Medway Pharmacy can advise on which options are appropriate for your stage of pregnancy and whether further medical review is needed.

When should constipation be seen by a GP?

Most constipation is short-lived and responds well to lifestyle changes and over-the-counter laxatives. However, there are certain warning signs — sometimes called red flags — that mean you should see your GP rather than self-treating at the pharmacy. These include blood in your stool (which may appear bright red or as dark, tarry stools), unexplained weight loss, persistent fatigue, and a change in your usual bowel habit lasting more than three weeks, particularly in adults over 50. These symptoms need medical investigation to exclude serious underlying causes.

Severe abdominal pain alongside constipation — especially if accompanied by bloating, vomiting, or the complete inability to pass wind — may indicate a bowel obstruction, which is a medical emergency requiring urgent assessment. Similarly, if constipation alternates with episodes of diarrhoea, this pattern should be discussed with a GP, as it can be associated with IBS or, less commonly, with more significant bowel conditions.

If you have been using over-the-counter laxatives for one to two weeks without improvement, it is worth speaking to your GP to explore whether there is an underlying cause that needs addressing — such as an under-active thyroid, medication side effects, or a structural problem. Our pharmacists at Medway Pharmacy in Gillingham are always happy to help you assess whether pharmacy treatment is appropriate, or whether your symptoms warrant a GP referral. Do not hesitate to speak to us before making that decision.

Constipation FAQ