Some antibiotics may need to be kept in the fridge whereas others need to be kept at room temperature. Ask your pharmacist about the proper storage conditions of the antibiotic you are taking.
It is important to complete the course of antibiotic treatment as prescribed by the doctor and take the correct dose at the right time. Do not stop taking the antibiotic midway, even if you feel better. This is to prevent antibiotic resistance, which may lead to infections that are harder to treat in the future.