Hello there.  I can understand your concern.  You need to dilute it before using it. The information is printed on the bottle itself. But, you can dilute equal amounts. Say you are taking 10ml betadine, then use 10ml water to dilute and then use the mixture to gargle. Do it for about 30-45 seconds and then you can spit it out. Best regards. Dr. Anil kumar jain. Bangalore.

15ml solution to be mixed with 15 ml water and gargled three  to four times a day

Hello.. Well you just have to take 5 ml of it or put into the cup and then take it into your mouth and start gargling.it will irritate your mouth but then it will help in reducing the inflammation...do it atleast twice a day...thank you