I have been encouraged by a friend to take Plexus for my lack of energy. However, I am on several medications and wonder if there could be possible adverse drug interactions. My medications are as follows: atenolol 25 mg, calcium citrate 600 mg, lipitor 20 mg, losartan 100mg, thyroxine 50mg, venlafaxine 18.5 mg, vitamin D3 5000 intl units, fiber con, multivitamin, fish oil, aspirin.