I take Metoprolol Succinate ER 50MG once per day. My prescription plan has moved this drug from Tier 1 to Tier 3 which results in an enormous price change. Is there a serious downside if I change to Metoprolol Tartrate? I realise that Succinate is extended release whereas Tartrate is immediate release. I also take other BP meds once per day so I doubt if the ER is essential.