Posted by iHerb Customer on Sep 11, 2011 | Verified Purchase
I took vinpocetine for my hearing, but so far I've not detected any improvements. I noticed that it's best to start off with 10 mg/day for several days before increasing the dosage. I began with 20 mg twice a day and had stomache problems and also dizziness. I immediately cut back to 10mg/day and then increased the strength slowly over two weeks. Now I'm taking 20mg twice daily and experience no problems.