What Lactaid tablets do

Lactaid tablets contain the enzyme lactase, which breaks down lactose—the natural sugar in milk and dairy products—into simpler sugars your body can digest. When you swallow a Lactaid tablet before eating dairy, the lactase enzyme goes to work in your small intestine, splitting lactose molecules into glucose and galactose. Your body absorbs these smaller sugars easily, which prevents the bloating, gas, cramps, and diarrhea that happen when undigested lactose reaches your colon.

The tablets work because many people stop producing enough lactase after childhood. Lactase is the only enzyme your body makes that can break lactose apart. Without it, lactose passes through your digestive system largely unchanged, and bacteria in your colon ferment it, creating gas and drawing water into your intestines. Lactaid replaces the lactase your body no longer makes in sufficient amounts.

Key Takeaways

  • Lactaid tablets contain lactase enzyme, which splits lactose into glucose and galactose so your small intestine can absorb them.
  • You take a tablet when ready before or with your first bite of dairy, and the enzyme works for about 30 minutes to two hours depending on the product strength.
  • Lactaid works only on lactose you eat at that meal—it does not build up in your system or treat lactose intolerance permanently.
  • The enzyme breaks down lactose in your food, not in your stomach; it works in your small intestine where most digestion happens.
  • Strength varies by brand and formulation, so a regular-strength tablet may not be enough for a large serving of ice cream or cheese.

When to take a Lactaid tablet

Take the tablet right before you eat dairy or with your first bite of food that contains milk, cheese, yogurt, or cream. The enzyme needs to be present in your small intestine at the same time the lactose arrives, so timing matters. If you wait until after you have eaten, the lactose has already moved past where the enzyme can work on it effectively.

The tablet's effect lasts roughly 30 minutes to two hours, depending on how much lactose you are eating and which strength you use. A regular-strength tablet handles a small serving—a glass of milk or a cup of yogurt. A maximum-strength tablet covers a larger meal with more dairy. If you are eating multiple dairy foods over several hours, you may need to take another tablet partway through.

How the enzyme reaches your small intestine

When you swallow a Lactaid tablet, it travels down your esophagus into your stomach like any other pill. Your stomach acid does not destroy the lactase enzyme because it is coated to survive stomach acid. The tablet dissolves in your small intestine, where the enzyme is released and mixes with the food you have eaten.

Your small intestine is where most lactose digestion normally happens anyway—this is where lactase naturally works when your body produces enough of it. By the time food reaches your small intestine, it has already been partially broken down by stomach acid and churning. The lactase enzyme then attaches to lactose molecules and splits them into the two straightforward sugars your intestinal lining can absorb directly into your bloodstream.

Different strengths and formulations

Lactaid comes in regular strength, maximum strength, and ultra strength tablets. Regular strength handles about one cup of milk or equivalent dairy. Maximum strength covers roughly two cups of milk or a larger serving of ice cream or cheese. Ultra strength is the most concentrated and works on the largest dairy meals. The difference is the amount of lactase enzyme in each tablet—more enzyme means it can break down more lactose.

You can also find Lactaid in caplet form, which some people find easier to swallow, and in chewable tablets that work the same way. Some formulations include additional ingredients like simethicone, which reduces gas, though the lactase itself is what handles the lactose. The enzyme is the same across all Lactaid products—only the dose and delivery method change.

What Lactaid does not do

Lactaid tablets treat the symptoms of eating dairy at one meal. They do not change your body's ability to make lactase, and they do not build up in your system over time. Each tablet works only on the lactose in that specific meal. If you eat dairy again later without taking another tablet, you will have the same symptoms as before.

The tablets also do not work on lactose that is already in your digestive system. If you have already eaten dairy and symptoms have started, taking a tablet will not reverse what has already happened. The enzyme can only work on lactose that has not yet been digested, so prevention—taking the tablet before eating—is how the product is designed to work.

How to know if a tablet is working

If you take a Lactaid tablet before eating dairy and you have no bloating, gas, cramps, or diarrhea afterward, the tablet worked. You may not feel anything—that is normal. The absence of symptoms is the sign of success. Some people notice they feel lighter or less uncomfortable after a meal when they use a tablet compared to when they do not.

If you take a tablet and still have symptoms, the most common reason is that you took a strength too low for the amount of dairy you ate. A regular-strength tablet may not be enough for a large bowl of ice cream or a cheese-heavy meal. Try a maximum or ultra strength tablet next time. Another possibility is that you took the tablet too late—after the lactose had already moved past your small intestine.

Cost and where to find them

Lactaid tablets are sold over the counter at most pharmacies, grocery stores, and online retailers. They are inexpensive compared to most over-the-counter medicines—a box of 60 tablets typically costs between $5 and $10, depending on strength and brand. Generic versions with the same lactase enzyme are usually cheaper than the name-brand Lactaid.

Some people find it cost-effective to keep a tablet or two in their wallet or bag for unexpected dairy. Others buy a box and keep it at home for regular use. Because the tablets have a shelf life of several years when stored in a cool, dry place, buying in bulk is practical if you use them regularly.

Frequently Asked Questions

Can I take more than one Lactaid tablet at once?

Yes. If you are eating a very large dairy meal or multiple dairy foods, taking two tablets at once is safe and will give you more enzyme to work with. Some people take one tablet and then another 30 minutes later if they are eating dairy over an extended period. The tablets have no serious side effects even at higher doses.

Does Lactaid work on all dairy products?

Lactaid works on any food that contains lactose, which includes milk, cream, ice cream, soft cheeses, yogurt, and butter. Hard cheeses like cheddar have very little lactose because most of it is removed during aging, so you may not need a tablet for them. Lactose-free dairy products already have the lactose removed, so a tablet is unnecessary.

Will taking Lactaid tablets make my body stop making lactase?

No. Taking Lactaid tablets does not affect your body's own lactase production. Your intestines will produce whatever amount of lactase they are genetically programmed to make, regardless of whether you use tablets. The tablets straightforward supplement what your body is not making enough of.

How long does it take for a Lactaid tablet to start working?

The tablet begins dissolving and releasing lactase within 15 to 30 minutes of reaching your small intestine. Since food takes roughly 30 minutes to an hour to move from your stomach into your small intestine, you should take the tablet right before eating so the enzyme is ready when the lactose arrives.

Can children use Lactaid tablets?

Yes, Lactaid tablets are safe for children and are sold in child-friendly formulations like chewables. Children can take them the same way adults do—right before eating dairy. If your child has lactose intolerance symptoms, a pediatrician can confirm it and recommend whether tablets are appropriate for their age and diet.