Probiotics in Pharmacy: Evidence-Based Recommendation Guide

Probiotics have gained enormous popularity, but do we really know when their recommendation from the pharmacy is supported by evidence? As pharmacists, it is crucial to offer science-based advice to optimise our patients' health.

What are Probiotics and How Do They Work?

Probiotics are live microorganisms that, when administered in adequate amounts, confer a health benefit on the host. Primarily, they work by modulating the intestinal microbiota, competing with pathogens, producing antimicrobial substances and strengthening the intestinal barrier. Strain diversity is key, as not all probiotics are the same nor do they have the same effects. It is essential to know the specific strain and its indication.

Research in this field is ongoing, and what is a solid recommendation today may be nuanced tomorrow. Therefore, it is vital to stay up to date and consult reliable sources such as the Spanish regulatory agency AEMPS or the EMA for any relevant developments in safety or efficacy (always check your own national regulator for regulatory matters).

Current Evidence: Key Indications for Pharmaceutical Advice

Scientific evidence supports the use of probiotics in several situations. One of the best known is the prevention of antibiotic-associated diarrhoea (AAD). Strains such as Lactobacillus rhamnosus GG or Saccharomyces boulardii have been shown to be effective. It is important to start taking the probiotic at the same time as the antibiotic and continue for a few days after finishing the course.

Other indications with good evidence include the management of acute infectious diarrhoea in children, irritable bowel syndrome (IBS) in certain subtypes, and the prevention of upper respiratory tract infections in specific populations. For an exhaustive review, guidelines such as those from the Spanish society SemFYC or the Spanish society SEFAC usually offer evidence-based summaries.

Practical Considerations for Dispensing

When recommending a probiotic, it is essential to ask the patient about their medical history, current medication and the reason for consultation. Not all probiotics are suitable for everyone; for example, in immunocompromised patients or those with severe illnesses, their use must be evaluated with caution. The pharmaceutical form (capsules, sachets, liquids) and storage conditions (refrigeration) are also important aspects to consider and communicate.

In addition, it is crucial to educate the patient on the importance of treatment adherence and realistic expectations. Probiotics are not a magic bullet and their effects may take time to manifest. We must always remember that pharmaceutical advice is a fundamental pillar of pharmaceutical care, and our responsibility is to offer clear, evidence-based information.

Myths and Realities: Debunking False Beliefs

There is a lot of misinformation surrounding probiotics. It is common to hear that 'all probiotics work for everything' or that 'the more strains, the better'. This is not true. Efficacy is strain-dependent and dose-dependent. A probiotic effective for AAD may not be effective for IBS, and vice versa. Furthermore, product quality is vital; not all probiotic supplements on the market guarantee the viability of microorganisms until the expiry date.

Another myth is that probiotics are always harmless. Although generally safe, they can cause mild side effects such as gas or bloating, and in rare cases, infections in vulnerable patients. Therefore, a good patient history and individualised advice are essential. To delve deeper into safety, we can always consult the CIMA summary of product characteristics if it is a registered medicine or supplement (check your national regulator for local product data).