What cascara is and why people take it

Cascara is a plant-based substance made from the dried bark of the cascara buckthorn shrub, native to the Pacific Northwest. People take it as a laxative—meaning it's intended to stimulate bowel movements and relieve constipation. The active compounds in cascara bark are called anthraquinones, which work by increasing muscle contractions in the colon.

Cascara has been used in traditional medicine for centuries and became popular in over-the-counter laxative products throughout the 20th century. You'll find it in some herbal teas, capsules, and dried preparations marketed for digestive support. Unlike some other herbal remedies, cascara has a fairly direct and well-documented effect: it makes your bowel move, usually within 6 to 12 hours of taking it.

Key Takeaways

  • Cascara is a dried plant bark used as a laxative to relieve constipation by stimulating colon contractions.
  • The substance works relatively quickly—most people experience results within 6 to 12 hours.
  • Long-term or frequent use of cascara can lead to dependence, where your bowel becomes less responsive without it.
  • The U.S. Food and Drug Administration removed cascara from over-the-counter laxative products in 2002 due to safety concerns about chronic use.
  • Cascara is still available in herbal supplements and teas, but it is not recommended for regular or extended use.

How cascara works in your body

When you take cascara, the anthraquinones in the bark reach your colon and trigger increased muscle contractions. These contractions move stool through your digestive system faster than normal, which is why people experience a bowel movement relatively quickly. The effect is stronger than what you'd get from dietary fiber alone, which is why cascara is classified as a stimulant laxative rather than a bulk-forming one.

The strength of cascara's effect depends on the dose and your individual sensitivity. Some people feel results within 6 hours; others may wait 12 hours or longer. Because the effect is fairly predictable, cascara was historically used as a reliable short-term solution for occasional constipation—the kind you might experience during travel or after a medication change.

Why the FDA removed cascara from over-the-counter products

In 2002, the U.S. Food and Drug Administration determined that cascara was no longer safe for use in over-the-counter laxative products sold in the United States. The decision was based on concerns about what happens when people use cascara regularly or for long periods. The main worry was laxative dependence—a condition where your colon becomes less responsive to normal signals and increasingly relies on the stimulant to function.

Chronic cascara use can also lead to electrolyte imbalances, where your body loses important minerals like potassium. Over time, this can affect heart rhythm and muscle function. Additionally, some research suggested potential links between long-term anthraquinone use and colon damage, though this remains an area of ongoing study. Because these risks outweighed the benefit for occasional constipation relief, the FDA removed cascara from the generally recognized as safe (GRAS) list for laxatives.

Where cascara is still available and how it's sold

Even though cascara is no longer in FDA-regulated over-the-counter laxatives, it remains available in the United States as a dietary supplement and herbal ingredient. You can find it in herbal tea blends, capsules, tinctures, and dried bark preparations sold through health food stores, online retailers, and some pharmacies. Because these products are classified as supplements rather than drugs, they are not subject to the same pre-market review that over-the-counter medications undergo.

The labeling and quality of cascara supplements can vary widely. Some products clearly state the amount of cascara per dose; others list it as part of a blend without specifying the quantity. If you encounter cascara in a product, the label should indicate it's intended for short-term use only, though not all products make this clear. Reading the ingredient list and any warnings on the package is important before purchasing.

Short-term use versus long-term use

Cascara is designed for occasional, short-term constipation relief—typically a few days at most. When used this way and at recommended doses, most people tolerate it without serious problems. The risk profile changes significantly if someone uses cascara regularly, several times a week, or for weeks on end. That's when laxative dependence becomes a real concern, along with the potential for electrolyte loss and other complications.

If you find yourself reaching for a laxative multiple times a week, that's a sign to talk with a healthcare provider about what's causing the constipation. Chronic constipation often responds better to dietary changes, increased water intake, regular movement, and sometimes medications prescribed by a doctor—not to repeated laxative use. A provider can help identify whether the constipation is related to diet, medications you're taking, a medical condition, or something else entirely.

Other options for constipation relief

If you're looking for constipation relief, several approaches work without the dependence risk that comes with cascara. Increasing fiber intake through whole grains, vegetables, legumes, and fruits helps most people over time. Drinking more water and moving your body regularly also support normal bowel function. These changes take longer than a laxative—usually several days to a week—but they address the underlying issue rather than just forcing a bowel movement.

For occasional constipation, bulk-forming laxatives like psyllium husk or methylcellulose are considered safer for short-term use than stimulant laxatives. Osmotic laxatives like magnesium citrate or polyethylene glycol (PEG) draw water into the colon, softening stool without triggering dependence. Stool softeners like docusate can help if hard stools are the main problem. A healthcare provider can recommend which option makes sense for your situation and help rule out any underlying conditions that need attention.

What to know before using cascara products

If you're considering a cascara product, start by checking the label for the amount of cascara per dose and any warnings about duration of use. Most responsible products recommend using cascara for no more than a week without consulting a healthcare provider. If you have a history of bowel problems, take medications that affect digestion, or have conditions like irritable bowel syndrome, talk with a provider before using cascara or any stimulant laxative.

Cascara can interact with certain medications and may reduce the absorption of some drugs if taken at the same time. It can also worsen dehydration if you're not drinking enough water. Pregnant and breastfeeding people should avoid cascara, as it can pass into breast milk and may affect a developing baby. If you experience severe cramping, persistent diarrhea, or signs of dehydration after taking cascara, stop using it and contact a healthcare provider.

Frequently Asked Questions

Is cascara the same as senna?

No. Both are stimulant laxatives made from plant bark, and both work through similar mechanisms, but they come from different plants. Senna comes from the Cassia plant, while cascara comes from the buckthorn shrub. Senna is still available in over-the-counter laxatives in the U.S., though it carries similar dependence risks with long-term use. Neither is recommended for regular use.

How long does cascara take to work?

Most people experience a bowel movement 6 to 12 hours after taking cascara, though some may feel results sooner or later depending on the dose and individual factors. This relatively predictable timing is one reason cascara was historically popular for occasional constipation. Taking it in the evening often means results by morning.

Can I become dependent on cascara if I use it once?

No. Laxative dependence develops with repeated or prolonged use, not from a single dose. Using cascara once or twice for occasional constipation is unlikely to cause dependence. The risk increases significantly if you use it multiple times a week or for several weeks in a row.

Why is cascara still sold if the FDA removed it?

Cascara is sold as a dietary supplement, which is regulated differently than over-the-counter drugs. The FDA removed cascara from over-the-counter laxative medications but did not ban it entirely. Supplements are allowed to contain ingredients that wouldn't be approved as drugs, though they must be labeled accurately and cannot make drug claims.

What should I do if cascara doesn't work?

If cascara doesn't produce results within 12 to 24 hours, don't take more. Instead, try increasing water intake, eating more fiber, and moving your body. If constipation persists beyond a few days or keeps returning, contact a healthcare provider to explore what might be causing it and what treatment makes sense for your situation.