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Lacto-B or lactobacillus is a probiotic supplement used to treat diarrhea, particularly diarrhea caused by antibiotic use. It can also be used to treat lactose intolerance and constipation. Generally, Lacto-B is for children’s use. It contains probiotics to help maintain a healthy digestive system.

Lacto-B contains bacteria such as Lactobacillus acidophilus, Bifidobacterium longum, and Streptococcus thermophilus. These are beneficial bacteria that live in your digestive system.

Lactobacillus acidophilus is a type of good bacteria that normally lives in the digestive, urinary, and genital systems without causing any disease. Lactobacillus restores the intestinal flora, post-antibiotic diarrhea, and prevents candidiasis.

This bacteria is also used in alternative medicine for treating diarrhea in children with rotavirus.

Dosage Considerations for Lacto-B

Do not change the dose without your doctor’s approval. If you miss a dose of Lacto-B, take the medicine as soon as you remember.

If it is near the time of the next dose, it is best to skip the missed dose of Lacto-B. Take the next dose at the usual time. Do not double up on a dose to make up for the previous dose.

The dosage Lacto-B considerations for children aged 1 to 12 years: 3 sachets per day.

Guidelines for Lacto-B

Use Lacto-B according to the directions on the product label or as directed by your doctor. Here’s how you should use Lacto-B:

  • If you consider using herbal supplements, seek advice from your doctor first. You may also consider consulting a herbal practitioner
  • Before taking this medicine, be sure to use it as directed on the product package or as directed by your doctor or pharmacist. Do not take more medicine than the recommended dose. 
  • Lactobacillus acidophilus is available as capsules, powders, tablets, or a vaginal suppository. Some dairy products, particularly yogurt, also contain Lactobacillus acidophilus.
  • The chewable tablet must be chewed before you swallow it.
  • Do not use different forms of Lactobacillus acidophilus at the same time without medical advice. Using different formulations together can increase the risk of an overdose.
  • Call your doctor if your condition does not improve or gets worse while using this product.
  • Store the medication as directed on the product label – away from moisture, heat and light.

What is Lacto-B Used For

Lactobacillus acidophilus is a type of ‘friendly’ bacteria that normally live in the digestive, urinary, and genital systems without causing any disease. Lactobacillus restores the intestinal flora, post-antibiotic diarrhea, and prevents candidiasis.

Lacto-B is most commonly used for treatments of lactose intolerance, constipation, and diarrhea – particularly diarrhea caused by using antibiotics

This bacteria can also be used to provide relief for diarrhea in children with rotavirus.

Contraindications for Lacto-B

Lacto-B is contraindicated with other medications and certain conditions, such as:

  • This medicine contains Lactobacillus. Do not take Lactobacillus acidophilus, Bacid, or Culturelle if you are allergic to lactobacillus or any of the ingredients in this medicine.
  • Patients with impaired immune system and gastrointestinal perforations. Gastrointestinal perforation occurs when a hole forms along the stomach, large intestine, or small intestine. It can be due to a number of different diseases, including appendicitis and diverticulitis. It can also occur in the gallbladder with symptoms similar to gastrointestinal perforation.


Pay attention to the precautions below before using Lacto-B to treat diarrhea. constipation, and other digestive system diseases:

  • Before taking Lacto-B, tell your doctor or pharmacist if you are allergic to it or if you have any other allergies. This product may contain inactive ingredients which can trigger allergic reactions or other problems.
  • Before using this medication, inform your doctor or pharmacist about your medical history.
  • Follow all directions on the product label. Inform your health care provider about your medical conditions, including allergies and any medications you are currently taking.
  • Ask your doctor, pharmacist, or other health care provider if it is safe for you to use this product if you have short bowel syndrome.
  • Consult your doctor before taking lacto-b if you have a weak immune system caused by certain diseases or medications.
  • Ask your doctor before using this product if you are pregnant or breastfeeding.
  • Do not give a child any herbal or health supplements without medical advice.
  • It is unknown whether Lacto-B is safe to drink while pregnant. It is best to discuss the risks and benefits with your doctor.
  • It is unknown if Lacto-B passes into breast milk. Consult your doctor before breastfeeding.

Lacto-B Drug Interactions

Do not take Lacto-B containing Lactobacillus acidophilus without medical advice, if you are taking any medications that can weaken your immune system, such as:

  • Medicines to prevent organ transplant rejection.
  • Steroid drugs, such as prednisone, dexamethasone, methylprednisolone, etc.

This list is not complete. Other drugs may interact with Lactobacillus acidophilus, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this product guide.

List of Lacto-B Side Effects 

Along with its needed effects, Lactobacillus acidophilus may cause some unwanted side effects. While not all of these side effects may occur, if they do occur, they may need medical attention.

Side effects that require immediate medical attention

Consult your doctor if any of the following side effects occur while taking Lacto-B, as these side effects require immediate medical attention, including:

  • Cough
  • Dizziness
  • Tightness in the chest
  • Difficulty swallowing
  • Difficulty breathing
  • Fast heartbeat
  • Itching or red rash
  • Unusual fatigue or weakness
  • Swelling of the eyelids or around the eyes, face, lips, or tongue

Side effects that do not require immediate medical attention

Some of the side effects of Lactobacillus acidophilus usually do not require immediate medical attention. These side effects may resolve during your treatment, as your body adapts to the medicine.

In addition, your healthcare professional may advise you on how to prevent or reduce some of these side effects.

Consult your health care professional if any of the following side effects persist or are bothersome:

  • Bloating
  • Passing gas

Side Effects of Lactose Intolerance

People with lactose intolerance cannot fully digest the sugar (lactose) in milk – which results in diarrhea, gas, and bloating after eating or drinking dairy products.

This condition is normally harmless, but the symptoms can be uncomfortable. Signs and symptoms of lactose intolerance usually begin 30 minutes to two hours after eating or drinking foods containing lactose.

Signs and symptoms of lactose intolerance include: 

  • Diarrhea
  • Stomach cramps
  • Gas pain
  • Abdominal bloating
  • Nausea and vomiting

Contact your doctor or pharmacist through Smarter Health to find out more about the recommended dosage for Lacto-B and its proper use based on your condition. Smarter Health allows you to access healthcare services whenever you need them.

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