0NobodyInParticular 10 years ago ReplyUpvote"At what age can drugs be used to treat a heart murmur?"That depends on the drug. In general, heart drugs are not well tested in children. Furthermore, a heart murmur in a child born with a healthy heart is likely to be harmless and temporary. Children born with a congenital heart problem, on the other hand, may require surgery."At what age can illegal stimulants cause heart murmurs?"Any age. The abuse of any kind of stimulant, even caffeine, can put harmful stress on the heart and blood vessels. Heart murmurs in adults may sometimes be harmless, but they can also result from a number of very serious conditions.