You can also try this trick which works for me
You place the palms of your hands on the sides of your head or over your ears and then drum/tap your fingers on the back of your head. After about 10-15 seconds, it will stop the ringing.
You place the palms of your hands on the sides of your head or over your ears and then drum/tap your fingers on the back of your head. After about 10-15 seconds, it will stop the ringing.