Here i believe its not true in all cases, some time Ayurvedic medicine along with allopatic medicine will help in reliving the side-effects caused by allopatic medicine like constipation, acidity, burning sensation, improper digestion etc so best to consult and inform your doctor what medication you take

Hello there...I can understand your concern. It never safe to mix medications. Especially when you are taking the medications for the same disease. Take either one of the line of medications. Because if they both contain the same element, you could be getting suprapharamacological dose. So trust one line of medications and take it correctly.