Can Betahistine For Hearing Problem Cause Dizzy Spells?

Hello iv been prescribed betahistine to sort out my hearing problem and I was experiencing really bad dizzy spells. But I was only given a 7 day course which I have to say I think have helped me. I haven t had the problem in last 7 days. I m scared when the tablets run out tomorrow things will return. How often can I take these tablets x