Hi, Thanks for writing to us, A heart murmur is seen in medical conditions of the heart when blood flows through a problematic area in the heart. Depending on the cause and extent of this condition an individual would need to take care not to exert or to take drugs that can alter the load to the heart. Redline energy drink has high amounts of caffeine and other products that can tend to increase heart rate when taken in excess which probably lead to the palpitations she experienced. Excess amounts of this drink should be avoided in known heart conditions. Marijuana also has the effect of increasing heart and pulse rate which if taken with this drink would increase the effects further. This should be strictly avoided. It is advisable to keep in touch with her doctor and be aware of the do s and dont s with regard to this medical condition apart from continuing prescribed medications. Hope your query is answered. Dr Anjana Rao Kavoor