5mg is simply tiny. Yes, I started at 10mg, and upped to 20mg one month later, only to find the relief was even better. I've since attempted to roll back to 15mg but found my eyes becoming more uncomfortable so I continue at 20mg for the time being ... I was an absolute useless heap of a zombie without this drug so I can't be more pleased really
Its not silver bullet though, it won't stop you getting vertigo attacks, but it makes them far more bearable and far less likely to cause you nausea.
The start of me taking the drug co-incided with remission from vertigo for 6 months which made me assume it was the drug, but sadly this was not the case and they came back full force.