Hello No this is not the side effects of medicine . Fever with chills and evening rise of temperature clearly indicates that treatment of tuberculosis is not playing its role . Either diagnosis is wrong or treatment is not responding . In my opinion get in Widal test and repeat X ray . If sputum present please get for A F B for expectoration . Some times patients ( if old lesion ) develops resistant to tubercular drugs , so keep this thing in mind and consult your doctor. As I have noted in so many cases that a freshly diagnosed patient responded ( to tubercular drug) from day one to drugs . Consult one more physician and get his opinion. Good luck.