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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Do you notice any calf swelling or pain? Rippling sensation is likely due to the nerve irritation while sitting down at the lower back. Recent antibiotic course can cause nerve inflammation as temporary side effect. Usually tends to improve over 2-3 weeks. Vitamin b12 1000 mpg daily, vitamin D 1000 IU daily, magnesium 400 mg daily may be helpful with the symptoms. Also avoid sitting for long time if possible.
Ok thanks for the info. Herniated discs also can cause nerve compression using such symptoms while sitting. However antibiotic is also a factor here. If no improvement in 2 weeks, you should see your doctor for physical therapy and herniated disc evaluation. Best wishes