Apparently 3 ppl died from this mix in Sweden, prompting some controversy.
I've been drinking this for the last 2 years regularly. Yes it'll up your heart beat, so if you're sensitive to stimulants, the same precautions exist as for ephedrine, heavy doses of cafeine etc.
I wouldn't try to get completely blitzed on it though, as I believe you can drink more than normally without getting shitfaced.