According to the World Health Organization:
However, there is a natural way to strengthen the antibiotic and even prevent it from being needed. This solution is colloidal silver.
According to a 2013 study published in the prestigious American magazine "Science Transational Medicine", adding silver to antibiotic treatment strengthens its effect even 1000 times! 
Do you remember from the previous article that bacterial cells protect themselves against the effects of an antibiotic by changing their external appearance or "throwing out" a drug? Chief scientist Jose Ruben Morones-Ramirez, professor at Universidad Autónoma de Nuevo León in Mexico, explains that silver facilitates the penetration of antibiotics into bacterial cells.
Silver can be seen as a Trojan horse that opens the door for antibiotics so that they can enter the cell and cause further damage," says Morones-Ramirez. "It's like having an antibiotic cocktail with a first aid kit in which the key is made of silver
Even the ancient Romans and Greeks knew that people eating silver cutlery are less likely to get stomach infections. To keep drinking water fresh for longer, the ancients put silver coins in the barrels with it. 
Nowadays, silver microparticles dissolved in water, the so-called colloid, are used for convenience. According to research, colloidal silver is an effective drug against many types of aerobic and anaerobic bacteria (those that need oxygen for development and those that do not need it), for example E. coli, causing food poisoning or antibiotic resistant bacteria P. aeruginosa, causing infections in hospitals and especially dangerous for people with cystic fibrosis.  
Colloidal silver also fights Candida albicans, which causes mycosis in immunocompromised persons. 
In the future, colloidal silver may be a medicine for HIV, due to its antiviral activity and regulation (modulation) of the immune system. 
Unfortunately, the independent and uncontrolled use of colloidal silver is risky because it can lead to the onset of silvery (argyria). The disease manifests itself in blue-silver coloring of the skin in places that have been exposed to sunlight. Srebrzyca does not pose a threat to health or life, but it is troublesome for the patient.  How can you take advantage of colloidal silver without compromising the risk of silver? Is it worth it at all?
Yes. Any drug in excess is dangerous, even table salt, present in every home in Poland, is lethal in certain doses. By using colloidal silver wisely, we can use its healing effects without exposing to side effects.
Instead of taking colloidal silver yourself, let's rely on ready-made products that contain them in safe quantities. Conjunctivitis, dry eye, sore throat, otitis, sinusitis, allergies, aphthas, thrush - each of these ailments can be shortened with colloidal silver preparations and reduced the need for antibiotic.
Due to the use of products only during illness, they are safe. And convenient forms of lozenges, sprays, drops or gel make the application simple and the medicines work exactly where they should be.