Cardioplen contains the active ingredient Felodipine, in strengths of either 2.5mg, 5mg or 10mg per tablet.The normal dose is one 5mg tablet a day, however your doctor may decide to increase this to 10mg if they feel you need it. If you have liver problems or are elderly, then your doctor may start you off on a slightly lower dose.If you forget to take your Cardioplen tablet then you should skip the forgotten dose and move straight onto the next one. Don’t worry but don’t double up on your dose to make up for a missed one.If you take more Cardioplen than you should, then go to your nearest emergency department immediately. An overdose can have symptoms such as extreme dizziness, problems with breathing or feeling weak so lying down with your arms and legs up is advised.