betawinCardiac arrhythmias: Betawin 50 mg (one Betawin-50 tablet) b.i.d or t.i.d should usually control the condition. It necessary the dose can be increased up to 300 mg per day in divided doses. Following the treatment of an acute arrhythmia with Betawin injection, continuationtherapy with Betawin tablets should be initiated 4-6 hours later. TheBetawin. 18694 likes. Betawin is a website that provides daily Soccer News & Predictions.