How To Make Penicillin At Home

Penicillin is an antibiotic that is commonly used to treat bacterial infections. While it is readily available at pharmacies and hospitals, it is possible to make it at home. In this article, we will discuss how to make penicillin at home.

What is Penicillin?

Penicillin is a group of antibiotics derived from the Penicillium fungi. It was discovered by Alexander Fleming in 1928 and has since saved countless lives. Penicillin works by inhibiting the growth of bacteria, making it an effective treatment for a wide range of bacterial infections.

Why Make Penicillin at Home?

Making penicillin at home may seem like a daunting task, but it can be a useful skill in situations where access to medical treatment is limited. It is also a useful way to ensure that the penicillin you are using is pure and free from harmful additives.

How to Make Penicillin at Home

To make penicillin at home, you will need the following materials: – A sterile work area – A penicillium culture – Sterile water – A growth medium (such as cornmeal agar) – A fermenter – A centrifuge – Ethanol – Acetone – A mortar and pestle – A filter – A pH meter

Step 1: Prepare the Growth Medium

To prepare the growth medium, mix cornmeal and water in a pot and bring it to a boil. Once it has cooled, add agar and stir until it dissolves. Pour the mixture into a petri dish and let it cool and solidify.

Step 2: Inoculate the Culture

Using a sterile inoculation loop, transfer a small amount of your penicillium culture to the center of the petri dish. Cover the dish and let it incubate at room temperature for several days.

Step 3: Transfer the Culture

After several days, transfer the penicillium culture to a larger container of growth medium. This will allow it to grow and produce more penicillin.

Step 4: Ferment the Culture

Transfer the penicillium culture to a fermenter and add sterile water. Adjust the pH to around 6.5 using a pH meter. Let the culture ferment for several days, stirring occasionally.

Step 5: Harvest the Penicillin

After several days, use a centrifuge to separate the penicillin from the culture. Discard the culture and transfer the penicillin to a mortar and pestle. Crush the penicillin into a fine powder.

Step 6: Purify the Penicillin

To purify the penicillin, dissolve it in ethanol and filter it through a filter paper. Repeat this process several times until the penicillin is pure.

Step 7: Dry the Penicillin

To dry the penicillin, dissolve it in acetone and let it evaporate. This will leave you with a pure, white powder.


Q: Can I use bread mold to make penicillin?

A: No, bread mold is not a suitable source of penicillin.

Q: Is it safe to make penicillin at home?

A: Making penicillin at home can be dangerous if proper safety precautions are not taken. It is important to work in a sterile environment and to use protective equipment such as gloves and a mask.

Q: Can I use homemade penicillin to treat infections?

A: No, homemade penicillin is not approved for medical use and may not be safe or effective.


While making penicillin at home may seem like a daunting task, it is possible with the right materials and equipment. However, it is important to remember that homemade penicillin is not approved for medical use and may not be safe or effective. Always consult a healthcare professional for proper medical treatment.