Our 3 yr old son has been diagnosed with SVT and has been having increasingly frequent episodes, recently one a week, then 3 in 2 days. The dr at hospital is advising us to consider giving him daily adenolol, (beta blocker) but we're a little concerned about any side-effects in young children- any tiredness or loss of capacity to exercise etc. Most of the time we can get theheart back to normal by holding him upside down etc! Have any of you had experience of your young child on adenolol and can advise? It's so confusing!