Oral Minoxidil worsen tinnitus left ear.

I have a buzzing / pulsatile sound in my left ear only. I consulted an ENT: - Pure Tone Audiometry (PTA): Normal - Tympanometry: Normal Since all tests were normal, I was not using any ENT medicines. Recently, I started having hair fall, so a dermatologist prescribed: - Oral Minoxidil 0.25 mg daily After starting oral Minoxidil, my left ear buzzing sound increased. I want to know the actual cause, because oral Minoxidil increased the sound, so maybe you can tell what the reason could be. I do not want to use random tinnitus medicines without knowing the cause. My questions: 1. What could be the cause of pulsatile buzzing when ENT tests are normal? 2. Why oral Minoxidil worsen tinnitus / pulsatile tinnitus? 3. Should I continue oral Minoxidil and increase the dose, or stop it? 4. Any test that can tell the actual reason for pulsatile ringing in the left ear, especially since it increased after oral Minoxidil? What is the reason for the buzzing sound