Smooth Move tea is safe to drink once a day for up to a few days, and no longer than one week in a row. The tea contains senna, a stimulant laxative, and the NHS recommends limiting senna use to a few days because longer use can make your bowels dependent on it. If you’re still constipated after three days, that’s the point to talk to a doctor rather than keep drinking it.
How the Tea Works
The active ingredient in Smooth Move is senna, a plant-based laxative that works by triggering your colon to push things along faster than it normally would. When senna reaches your large intestine, it gets broken down into compounds that activate immune cells in your colon wall. Those cells release chemical signals that reduce water absorption and speed up contractions in the lower part of your digestive tract. The result is a bowel movement, typically within 6 to 12 hours after drinking the tea.
Because the effects take several hours, most people drink it in the evening and experience results the following morning. Steeping the tea longer produces a stronger brew with more active compounds, so if you find the effects too intense, try a shorter steep time. If the effects are too mild, steep a bit longer before increasing to a second cup.
Safe Frequency and Duration
Stick to one cup per day, and limit your use to the shortest stretch that resolves your constipation. For most people, one to three days is enough. The upper boundary recommended by health authorities is one week. Beyond that, you risk your colon becoming reliant on senna to function, which can actually worsen constipation over time.
This isn’t the kind of tea you should work into a daily routine. If constipation comes back frequently, that’s a signal to address the underlying cause (fiber intake, hydration, physical activity, or a medical condition) rather than reaching for Smooth Move again. Occasional use with breaks in between is fine, but repeated week-long stretches without a clear gap can start to cause problems.
What Happens With Overuse
Senna doesn’t just move your bowels. It also changes how your colon handles water and electrolytes, particularly potassium. When used too frequently, it can deplete potassium levels, which ironically slows intestinal motility and makes constipation worse. This creates a cycle where you feel like you need more of the laxative, but it’s the laxative itself that’s contributing to the problem.
Chronic overuse can also trigger your body to compensate for fluid loss by ramping up a hormonal system that retains sodium and water. If you then stop taking the tea abruptly after prolonged use, that retention system doesn’t shut off immediately, which can cause noticeable swelling and bloating.
There’s also a visible change that can occur in the colon itself. Using stimulant laxatives for longer than about two weeks can damage the cells lining the colon, producing a condition called melanosis coli, where the inner lining turns dark brown or black. This is considered benign and typically reverses after you stop, but it’s a clear sign of overuse.
Who Should Be Extra Cautious
If you take diuretics (water pills), steroid medications like prednisolone, or heart medications like digoxin, senna can worsen electrolyte imbalances that make those drugs less safe. The combination of a diuretic and a stimulant laxative is particularly risky for potassium depletion. Herbal remedies containing licorice root can compound the same problem. Let your doctor know before combining any of these with Smooth Move.
For breastfeeding mothers, senna at normal doses appears safe. Multiple controlled studies have found that the active compounds either don’t pass into breast milk at all or appear in amounts far too small to affect a nursing infant. One randomized trial of over 280 breastfeeding women found no difference in loose stools or diarrhea between infants whose mothers took senna and those who took a placebo.
Alternatives for Ongoing Constipation
If you find yourself wanting Smooth Move more than once or twice a month, it’s worth building other habits that keep things moving on their own. Fiber from whole grains, fruits, vegetables, and legumes adds bulk that your colon can work with naturally. Adequate water intake (roughly 8 cups a day for most adults) keeps stool soft. Regular physical activity stimulates the muscular contractions in your intestines. Osmotic laxatives, which draw water into the colon without stimulating nerve activity, are generally considered safer for longer-term use than stimulant options like senna, though they also have limits.
Smooth Move works well as an occasional, short-term fix. The key is treating it like a tool you pull out when you need it, not a supplement you rely on regularly.