Enavant BOULK9 Capsules 250mg (Saccharomyces Boulardii) for Dogs & Cats

Enavant Boulk9 Probiotic Tablets for Dogs and Cats - 5 Billion CFU of the One Probiotic That Survives Antibiotics

Most probiotics have one fundamental problem: they don't survive antibiotics. Give your dog a standard bacterial probiotic alongside an antibiotic course, and the antibiotic will kill a significant portion of those probiotic bacteria along with the harmful ones - defeating the purpose entirely.

Boulk9 is different. Its active ingredient, Saccharomyces boulardii (CNCM I-1079), is a yeast - not a bacterium. Antibiotics don't kill it. This makes Boulk9 one of the only probiotics you can give confidently during an antibiotic course, not just after it, to protect the gut in real time while the medication is doing its work.

Each HPMC tablet contains 5 billion CFU (250 mg) of the clinically studied Saccharomyces boulardii strain CNCM I-1079 - the specific strain used in the majority of the published research on S. boulardii in both human and veterinary medicine. Manufactured by Stanford Laboratories Private Limited and marketed in India by Enavant Research LLP, Ahmedabad - a specialist veterinary nutraceutical company focused exclusively on clinically backed formulations.

Available as 1 strip of 10 tablets at ₹392.

What Are the Uses and Benefits of Enavant Boulk9 Tablets?

Boulk9 is a single-strain, high-potency S. boulardii supplement used specifically where gut health has been - or is likely to be - disrupted. Here's where it makes the clearest difference:

• During and after antibiotic treatment is Boulk9's strongest use case. Antibiotics are non-selective - they disrupt the gut microbiome broadly alongside the targeted infection. Boulk9 can be given from day one of the antibiotic course because S. boulardii is antibiotic-resistant by nature. It maintains a population of beneficial organisms in the gut throughout treatment, reducing the severity of antibiotic-associated diarrhoea and significantly shortening the microbiome recovery window after the course ends. For more on why the gut needs support during antibiotic treatment, the blog on probiotics for dogs - the must-know guide for loving pet parents explains the connection clearly.
• Diarrhoea management - including infectious diarrhoea and traveller's diarrhoea - is one of the most studied applications of S. boulardii. The CNCM I-1079 strain directly inhibits the growth of gut pathogens including Salmonella typhimurium and Yersinia enterocolitica, and produces proteases that break down the toxins produced by Clostridium difficile and E. coli. This means Boulk9 doesn't just restore balance - it actively fights the organisms causing the problem.
• Inflammatory bowel disease (IBD) and chronic digestive sensitivity in dogs and cats respond well to regular S. boulardii supplementation. The strain increases intestinal short-chain fatty acids (SCFAs), which have direct anti-inflammatory effects on the gut lining, regulate gut motility, and serve as an energy source for colonocytes - the cells that line the intestinal wall.
• Immune support is a less obvious but clinically important benefit. S. boulardii increases secretory IgA (sIgA) levels in the gut - IgA is the first line of immune defence at mucosal surfaces. Pets with higher sIgA levels are better equipped to resist gut infections and recover faster from illness. This makes Boulk9 useful not just during illness but as a regular supplement for pets who seem to pick up gut infections frequently.
• Stress-related gut disruption - from boarding, travel, or changes in routine - is another area where Boulk9's fast-acting, antibiotic-resistant profile is useful. Give it before and during the stressful period to maintain gut stability.
• For a deeper understanding of the gut-health connection in cats specifically, the blog on understanding the importance of cat gut health is a helpful read.

What Are the Possible Side Effects?

• Boulk9 is very well-tolerated by dogs and cats. As a single-strain, high-purity yeast supplement with no added flavourings or fillers beyond pharmaceutical-grade excipients, side effects are uncommon.
• In some pets, particularly during the first few days of supplementation, mild changes in stool consistency - slightly looser or firmer - can occur as the gut adjusts. This is a normal transition response and typically settles within 3-5 days.
• In extremely rare cases, pets with severely compromised immune systems may experience adverse reactions to live yeast supplementation. If your pet is immunocompromised due to chemotherapy, immunosuppressive medications, or a severe systemic illness, consult your vet before starting Boulk9.
• If your pet develops any unusual or prolonged symptoms after starting supplementation, discontinue and contact your vet.

How Should You Give Boulk9 Tablets to Your Pet?

• The tablet can be given directly by hand, hidden in a small amount of food, or mixed into wet food. S. boulardii is unaffected by gastric acid and bile - meaning the organism survives the stomach journey to the intestine regardless of whether it's given with food or without. This makes administration genuinely flexible.
• Standard dosing:

• For cats and kittens: 1 tablet daily regardless of weight, or as directed by your vet.
• During active diarrhoea or an antibiotic course: dose at the higher end of the range and maintain consistently throughout the treatment period and for at least 2 weeks after.
• For ongoing gut health maintenance: 1 tablet daily or as your vet advises based on your pet's specific history.
• Each strip contains 10 tablets at ₹392 - sufficient for a 10-day course at 1 tablet daily for a medium dog, or a 5-day course at 2 tablets daily.

How Does Boulk9 Work?

Boulk9 works through a single, very well-studied probiotic yeast - Saccharomyces boulardii strain CNCM I-1079 - that acts through multiple mechanisms simultaneously. Here's what it actually does inside your pet's gut:

• It kills harmful bacteria directly. S. boulardii produces proteases - enzymes - that break down the toxins produced by Clostridium difficile and E. coli endotoxin. It also directly inhibits the growth of Salmonella typhimurium and Yersinia enterocolitica. Unlike bacterial probiotics that simply compete for space, S. boulardii actively degrades the tools harmful bacteria use to cause damage.
• It survives everything the gut throws at it. S. boulardii is naturally resistant to gastric acid, bile salts, and antibiotics. This is the core advantage of using a yeast rather than a bacterium. It reaches the intestine intact, in full viable form, every time - giving it the opportunity to colonise and work from the moment it arrives.
• It reduces inflammation in the gut lining. S. boulardii increases intestinal short-chain fatty acids - particularly butyrate - which are the primary energy source for the cells lining the intestinal wall and have direct anti-inflammatory signalling properties. This is why S. boulardii is effective in IBD, not just infectious diarrhoea.
• It boosts the gut's immune defences. By stimulating secretory IgA production, S. boulardii strengthens the mucosal immune barrier - the gut's first line of defence against pathogens. Higher sIgA levels mean faster pathogen clearance and fewer recurring gut infections.
• It accelerates microbiome restoration after antibiotics. Research shows S. boulardii actively promotes faster re-establishment of the normal bacterial gut flora after disruption, compared to pets given no probiotic support. This is the reason giving it during - not just after - an antibiotic course makes a meaningful clinical difference.

What Safety Advice Should You Know Before Using Boulk9?

• Boulk9 is a supplement, not a pharmaceutical drug. It is safe for dogs, cats, puppies, and kittens when given at the recommended dose.
• Do not use in pets with known yeast allergies or hypersensitivity to Saccharomyces species.
• Use with caution in pets who are severely immunocompromised - on chemotherapy, immunosuppressive medications, or managing a severe systemic infection. In cases of extreme immune suppression, live yeast supplementation requires vet assessment before starting.
• This supplement is not a substitute for veterinary treatment of diarrhoea, IBD, or other gut conditions. If your pet has ongoing, severe, or bloody diarrhoea, significant weight loss, or persistent vomiting alongside gut symptoms - see your vet for a proper diagnosis before relying on supplementation alone.
• Store below 25°C in a cool, dry place away from direct sunlight. Keep the strip sealed until each tablet is used - moisture degrades the live yeast cultures. Keep out of reach of children.

What Should You Do If You Miss a Dose?

• Give the dose as soon as you remember and continue from there. There is no need to double up.
• For pets receiving Boulk9 specifically during an antibiotic course, consistency is more important than in general maintenance use. Try not to miss doses during the active treatment window - the goal is to maintain a continuous population of S. boulardii in the gut throughout the disruption caused by the antibiotics.
• Tying each dose to your pet's regular meal time is the most reliable way to stay consistent without needing a separate reminder.

What Are All the Substitutes for Enavant Boulk9 Tablets?

If Boulk9 is unavailable or you'd like to compare other probiotic options, here are alternatives available on Supertails. Note that most multi-strain probiotics do not contain S. boulardii specifically - if antibiotic resistance is the key requirement, confirm the substitute contains S. boulardii before switching:

What Are Some Quick Tips for Getting the Most Out of Boulk9?

• Start on day one of any antibiotic course - not after it ends. S. boulardii's antibiotic resistance means it survives alongside the antibiotic, maintaining gut support throughout the disruption rather than arriving after all the damage is done.
• Continue for at least 2 weeks after the antibiotic course ends. Research on S. boulardii consistently shows that the microbiome restoration window extends well beyond the last antibiotic dose - stopping the probiotic the moment antibiotics end leaves the gut without support during a vulnerable recovery period.
• Keep each tablet in the sealed strip until you're ready to use it. Moisture and heat degrade live yeast cultures - don't tip tablets into a container or leave strips open.
• For pets with a history of recurring diarrhoea or gut sensitivity, consider Boulk9 as a daily maintenance supplement rather than just a reactive one. Regular S. boulardii supplementation maintains sIgA levels and gut barrier function, reducing the frequency of flare-ups over time. For more on building a long-term gut health routine, the blog on gut health in dogs is a helpful read.
• If your pet has multiple gut triggers - antibiotics, travel, boarding, and dietary changes - giving Boulk9 before and through the triggering period, not just during the aftermath, gives the best results.

You Might Also Be Interested In...

• The full probiotics for dogs and cats collection brings together all vet-approved probiotic and prebiotic options - single-strain, multi-strain, powder, capsule, and syrup formats - so you can find the right fit for your pet's specific situation.
• For pets currently dealing with active diarrhoea alongside probiotic support, the gastric medicines collection has vet-approved antidiarrheal treatments that work alongside Boulk9 for faster resolution.
• The dog gut health care collection and cat health and wellness collection bring together a broader range of digestive health tools - from medicines to supplements - for pets managing ongoing gut conditions.
• For pets on an antibiotic course who need comprehensive gut and recovery support beyond probiotics, the dog health and wellness collection has immune support and recovery supplements worth discussing with your vet.
• And if your pet has recurring gut issues that aren't fully explained - persistent loose stools, frequent infections, or poor weight gain despite a good diet - Supertails' online vet consultation service connects you with a vet quickly for a proper assessment.

Disclaimer: Supertails' sole intention is to ensure that its consumers get information that is expert-reviewed, accurate, and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Give Your Pet's Gut the Protection It Needs - Especially When Antibiotics Are Involved

Most pet parents give probiotics after an antibiotic course. With Boulk9, you can start from day one - because S. boulardii is the rare probiotic the antibiotic can't touch. Five billion colony-forming units of the clinically studied CNCM I-1079 strain, in a single daily tablet, working to clear harmful bacteria, reduce gut inflammation, and restore balance in real time.

Whether your pet is currently on antibiotics, recovering from diarrhoea, managing IBD, or simply prone to gut sensitivity - Boulk9 is the kind of targeted, science-backed gut support that makes a real, measurable difference. One strip of 10 tablets at ₹392. Shop the Enavant Boulk9 Tablets for Dogs and Cats on Supertails and get them delivered to your door.

FAQs

What is Enavant Boulk9 used for in dogs and cats?

Boulk9 is a single-strain probiotic supplement containing 5 billion CFU of Saccharomyces boulardii CNCM I-1079 per tablet. It is used to restore and protect gut health during and after antibiotic treatment, manage diarrhoea caused by gut pathogens, support pets with IBD or chronic digestive sensitivity, and boost gut immunity by increasing secretory IgA levels. It's suitable for dogs, cats, puppies, and kittens.

Can I give Boulk9 to my pet while they're still on antibiotics?

Yes - this is one of Boulk9's key advantages. Saccharomyces boulardii is a yeast, not a bacterium, which means antibiotics cannot kill it. It can be given from day one of the antibiotic course and will survive and work throughout the treatment period. Most probiotics should be given a few hours apart from antibiotics; with Boulk9, timing relative to the antibiotic dose is less critical - though spacing them by 2 hours is still a reasonable approach.

How many Boulk9 tablets does my dog need per day?

The dose is 1 tablet per 5 kg of body weight, given daily. A 5 kg dog gets 1 tablet; a 10 kg dog gets 2; a 20 kg dog gets 4. For cats, the standard dose is 1 tablet daily regardless of weight. Your vet may adjust this based on your pet's specific condition and the severity of the gut disruption being managed.

How is Boulk9 different from regular multi-strain probiotics?

Boulk9 contains a single, well-studied strain of Saccharomyces boulardii - a probiotic yeast rather than a bacterium. Unlike bacterial probiotics, it is naturally resistant to antibiotics, gastric acid, and bile. It also directly inhibits gut pathogens and breaks down bacterial toxins, rather than simply competing for space. For pets on antibiotics specifically, or those with pathogen-driven diarrhoea, single-strain S. boulardii is often more targeted and effective than a general multi-strain supplement.

How long should I give Boulk9 after an antibiotic course ends?

Continue for at least 2 weeks after the last antibiotic dose. Research consistently shows that the gut microbiome restoration window extends well beyond the end of the antibiotic course - stopping supplementation immediately when antibiotics end leaves the gut without support during the recovery period when bacterial recolonisation is still fragile. For pets with a history of recurring gut disruption after antibiotics, your vet may recommend a longer maintenance course.

Can I give Boulk9 to my kitten?

Yes - Boulk9 is safe for kittens as well as adult cats. The standard dose for cats and kittens is 1 tablet daily. For very small kittens under 1 kg, confirm the dose with your vet before starting. The tablet can be opened and the contents mixed into a small amount of wet food if your kitten won't take the tablet directly.

Does Boulk9 need to be refrigerated?

No - store at room temperature below 25°C in a cool, dry place away from direct sunlight. Keep each tablet in the sealed strip until use - moisture and heat degrade live yeast cultures. Do not tip the tablets into an open container for storage. Refrigeration is not required and not recommended unless specifically indicated on the packaging.

Is Boulk9 safe for long-term daily use?

Yes - at the recommended dose, Boulk9 is safe for daily, long-term use in healthy dogs and cats. Many vets recommend it as an ongoing daily supplement for pets with IBD, chronic gut sensitivity, or a history of frequent antibiotic use. The exception is pets who are severely immunocompromised - in those cases, consult your vet before starting long-term live yeast supplementation.