hello, pyelonephritis as you might know is infection of kidney tissue with the pelvicalyceal system. Normally antibiotics are given for time period of 5 days to 1 week depending on severity of infection. As you have been recently started on Augmentin it might take about 3- 4 days to see any noticeable effects. You can go for work but due to infection you might have weakness, frequent urination, small bouts of fever. If your work does not involve lot of physical activity or strenuous work you can try working but otherwise its better to rest for more 2-3 days and then resume your work. I hope I answered your query. Thank you