Alverine Citrate Capsules

Alverine citrate is an antispasmodic medicine used to ease the cramping abdominal pain of irritable bowel syndrome (IBS), and it's also licensed for the relief of period pain (primary dysmenorrhoea). In the UK it's most commonly sold under the brand name Spasmonal, which comes in two strengths — 60 mg (Spasmonal) and 120 mg (Spasmonal Forte) — along with a combination product called Spasmonal Plus that adds simethicone (an anti-bloating agent) to the alverine. Generic alverine citrate capsules are also widely available and contain exactly the same active ingredient at the same strengths.

This is the most useful question to answer first, because alverine and mebeverine are siblings rather than rivals — they belong to the same class of medicines and do broadly the same job, but they're chemically distinct molecules and some patients respond better to one than the other. Both are direct smooth muscle relaxants — they work on the muscle of the gut wall itself rather than on the nerves that signal to it, which is why neither has the anticholinergic side effects (dry mouth, blurred vision, urinary hesitation) of older antispasmodics like Buscopan. The differences are subtle but practical. Mebeverine is taken consistently 20 minutes before each meal, while alverine has slightly more flexibility around food timing. Mebeverine comes in a twice-daily modified-release option (Colofac MR), while alverine is generally taken three times daily across both strengths. Alverine has the additional licensed use for period pain, which mebeverine doesn't. And — importantly — some patients who didn't get much benefit from one will get clear benefit from the other, which is why prescribers will sometimes suggest switching between them rather than concluding that "antispasmodics don't work for you."

The wall of the intestine contains a layer of smooth muscle that contracts in coordinated waves to push food and waste along. In IBS, those contractions become exaggerated and painful — the gut wall goes into spasm rather than producing gentle, rhythmic waves. Alverine works directly on that smooth muscle, persuading it to relax. What's clever about it is that it eases the spasmodic contractions specifically without switching off normal motility, so you get pain relief without becoming bloated or sluggish. It's thought to work partly by affecting how calcium moves into the muscle cells — calcium is the trigger that tells muscle to contract, so dampening that signal calms the spasm at source. The same mechanism explains why alverine also works for period pain: the uterus is largely smooth muscle too, and the cramping pain of dysmenorrhoea is driven by similar exaggerated contractions, which alverine can help relax.

The active ingredient is identical; only the dose per capsule differs. Spasmonal 60 mg is the standard strength, typically taken as one or two capsules three times a day depending on symptom severity. Spasmonal Forte 120 mg delivers the same total daily dose in fewer capsules — usually one capsule three times daily. The Forte version is useful if you're regularly taking two 60 mg capsules per dose anyway, or if swallowing fewer capsules makes adherence easier. Effectiveness is the same when matched dose-for-dose; the choice is mainly about convenience.

Spasmonal Plus is a combination capsule containing alverine citrate (the antispasmodic) and simethicone. Simethicone is a defoaming agent — it breaks up the small bubbles of trapped gas in the gut that cause bloating, discomfort, and that "windy" feeling many IBS sufferers know well. It isn't absorbed and works locally in the bowel. So Spasmonal Plus is designed for people whose IBS picture includes both spasm and significant bloating — the alverine eases the cramping while the simethicone tackles the trapped wind. If bloating isn't a prominent symptom for you, standard Spasmonal is fine; if it is, the Plus version may add useful benefit.

The standard adult regimen depends on the strength: Spasmonal 60 mg is taken as one or two capsules three times a day, and Spasmonal Forte 120 mg is taken as one capsule three times a day. Swallow the capsules whole with water rather than chewing or opening them. Unlike mebeverine, alverine doesn't have a strict "20 minutes before meals" rule — you have more flexibility about whether to take it before, with, or after food. That said, many people find it most useful to take a dose just before each main meal, because food entering the gut is one of the most common triggers for IBS cramping, and pre-meal dosing means the medicine is already starting to work as the gastrocolic reflex kicks in.

Yes, and this is one of alverine's distinctive features in the UK antispasmodic range. Primary dysmenorrhoea — painful periods without an identifiable underlying cause — is driven by exaggerated contractions of the uterine smooth muscle, which is the same kind of tissue alverine relaxes in the gut. Because of this, alverine is licensed for both indications, and women who experience both troublesome IBS and bad period pain sometimes find that a single medicine helps both problems. It's not a substitute for first-line period pain medicines like ibuprofen or naproxen, which target the inflammatory chemicals (prostaglandins) driving the contractions, but it can be a useful add-on or alternative for women who can't tolerate NSAIDs.

Some people notice an easing of cramping within the first few days of consistent use, particularly on post-meal spasm. Others build up to a noticeable benefit over two to four weeks. Like mebeverine, alverine isn't a conventional painkiller — it doesn't dull pain the way paracetamol does — so it works best when taken consistently rather than only when symptoms strike. A fair trial of alverine is at least three to four weeks of regular three-times-daily use before deciding whether it's helping. If you've been taking it on and off, that may be why the benefit isn't yet clear.

Yes, generally speaking. Alverine has been used for decades in the UK and has a reassuring long-term safety profile. It doesn't accumulate in the body, isn't habit-forming, doesn't have anticholinergic side effects, and doesn't typically affect the liver, kidneys, or other organs in the way some long-term medicines can. Many people take it for months or years through periods when their IBS is active, then taper off or stop during quieter spells, then return to it during flares. A periodic review with your prescriber — every six to twelve months — is sensible, both to check that it's still helping and to discuss whether dietary, lifestyle, or other measures could add further benefit.

Alverine is one of the better-tolerated IBS medicines, which is much of its appeal. Most people experience no side effects at all. When they do occur, they're typically mild — occasional nausea, headache, dizziness, or skin reactions including rash and hives. Severe hypersensitivity reactions, including angioedema (swelling of the face, lips, or throat) and very rare anaphylaxis, have been reported but are uncommon. Any rash with breathing difficulty, throat tightness, or facial swelling warrants stopping the medicine and seeking urgent advice. Like mebeverine, alverine doesn't cause the dry mouth, blurred vision, or urinary effects of older anticholinergic antispasmodics.

There's no direct interaction between alverine and alcohol — a glass of wine or a beer is unlikely to cause a problem from the medicine itself. The wider issue is that alcohol is a recognised IBS trigger for many people. It can speed gut transit, irritate the gut lining, and disturb the gut microbiome, all of which can flare IBS symptoms regardless of which medicine you're taking. So while there's no strict medical reason to abstain, paying attention to whether alcohol seems to bring your symptoms back, and moderating accordingly, is part of sensible IBS management.

The safety data in pregnancy and breastfeeding is limited, and the manufacturer recommends caution. Most clinicians prefer to avoid alverine during pregnancy unless it's clearly needed and other measures haven't worked. Breastfeeding sits in a similar grey zone — small amounts may pass into breast milk, and again, alternative approaches are usually preferred. If you're pregnant, planning a pregnancy, or breastfeeding and your IBS or period symptoms are significant, it's worth a direct conversation with your GP rather than self-managing — there are options that are better studied in these settings, including paracetamol for period pain and dietary measures for IBS.

This is one of alverine's quieter advantages: it has very few clinically significant drug interactions. It doesn't meaningfully affect blood thinners, blood pressure medicines, antidepressants, hormonal contraceptives, or most other commonly prescribed drugs. That makes it a good choice for older patients on multiple medications and for anyone with a complex prescription list. As always, it's worth telling any prescriber that you're taking it, particularly when starting new medicines, but compared with many other gut medicines the interaction profile is gentle.

For most people, no — and this is where IBS care has changed significantly in the last decade. The evidence is now strong that dietary and lifestyle measures play at least as big a role as medication in long-term IBS control. The most effective dietary approach for many people is the low-FODMAP diet, a structured elimination and reintroduction of certain fermentable carbohydrates that ferment in the gut and produce gas, distension, and loose stool in IBS-prone individuals — ideally guided by a dietitian, because done badly it can become unnecessarily restrictive. Beyond diet, regular exercise, adequate hydration, attention to sleep, stress management, and — for some people — gut-directed psychological therapies such as cognitive behavioural therapy or hypnotherapy have all been shown to make meaningful differences. Alverine is a useful tool for the painful, spasmodic dimension of IBS, but it sits within a broader plan rather than instead of one.

Several alternatives exist, and one approach often works where another doesn't — which is genuinely one of the most important messages in IBS care. Mebeverine (covered in detail elsewhere in this series) works through a similar mechanism but is a different molecule, and a substantial number of people who don't respond to one direct smooth muscle relaxant will respond to the other. Buscopan (hyoscine butylbromide) works on the nerve signal rather than the muscle itself and gives faster acute relief during flares. Peppermint oil capsules (Colpermin, Mintec) have a small but real evidence base for IBS pain, using menthol's effect on smooth muscle calcium channels. For diarrhoea-predominant IBS, loperamide helps slow gut transit. For constipation-predominant IBS, fibre adjustments, ispaghula husk (Fybogel), or specific laxatives may be more useful — and the combined product Fybogel Mebeverine exists precisely for those who need both effects. Low-dose tricyclic antidepressants (such as amitriptyline) and SSRIs are sometimes used not for depression but for their effect on gut-brain signalling and visceral pain, and can be transformative for people with persistent IBS pain. If alverine alone hasn't helped after a fair trial, the next step is usually to broaden the approach in conversation with a clinician.

A few situations call for prompt medical review rather than self-management — and they matter, because IBS is what's known as a diagnosis of exclusion, meaning other conditions need to be ruled out first. The features that warrant urgent assessment, often called "red flags", include unintentional weight loss, rectal bleeding or blood in the stool, persistent diarrhoea (especially at night, which IBS doesn't typically cause), iron-deficiency anaemia, a family history of bowel or ovarian cancer, new bowel symptoms starting after age 50, an abdominal or rectal mass, and any markedly worsening symptoms. None of these features fits IBS, and they need investigation to exclude inflammatory bowel disease (Crohn's, ulcerative colitis), coeliac disease, and bowel cancer. For period pain specifically, severe pain that's getting worse over time, pain outside the menstrual period, pain during sex, or pain associated with heavy bleeding or fertility difficulties can suggest endometriosis or other gynaecological conditions and warrants review. Beyond the red flags, a clinical review is also worthwhile if symptoms aren't responding to standard measures, if they're significantly affecting your quality of life, work, or sleep, or if you've never had a formal diagnosis. There's no need to push through quietly — modern IBS care can make a transformative difference.