The doctor prescribed me Azethral 500 mg for three...

When there is a loss of smell, high fever, shortness of breath, diarrhea, cough and sore throat, you must isolate yourself at home and contact the competent medical authorities to rule out infection with corona

How to treat lethargy and dizziness

Azethral  is an antibiotic which is given to treat some bacterial infection in the body like chest or throat infection and if there is no responce to this medication this may mean that it is not effictive against the bacterial infection that affect you and in this case culture from the site of infection can be done to know which bacteria cause the infection which allow the physician to give the appropriate medication also using Oroprad which contain cortisone can cause lethargy and instead of it you can use ibuprofen to alleviate the symptoms

How to diagnose lethargy and dizziness

you should be examined by the physician and throat swap can be taken and PCR should be done to exclude infection with Covid 19 also CBC can be done to exclude elevation in white blood cells

What are the causes of lethargy and dizziness

bacterial infection
viral infection
medication like cortisone

advice

you should be assessed by the physician to has the lab tests done and provide the treatment