Before you start taking doxycycline make sure you have an honest conversation with your doctor. Talking to your doctor is the single most important thing for you to do, as that way you will make sure your treatment will be successful and you will benefit from it as much as possible. In case of being allergic to other medicines that are close to doxycycline in their action such as minocycline, tetracycline and demeclocycline, you are not supposed to be taking this medicine. A history of an allergic reaction is a contraindication for taking doxycycline as the same reaction is likely to happen again. An allergic reaction happens because the body perceives something (in this case – doxycycline) as a potentially dangerous factor that can affect your health and wellbeing and reacts to this threat accordingly causing unpleasant reactions. If you are allergic to doxycycline – this is for a lifetime, and it’s best not to try taking it to see what happens. If you have taken doxycycline anyway and got an allergy – seem emergency medical help and do not take any more of doxycycline until you talk to your doctor. Doxycycline should not be given to children that are younger than 8 is this medicine has been reported to cause permanent yellowing or graying of the teeth; at the same time it can affect the child’s Although there are not too many contraindications for using doxycycline, they need to be taken seriously. If you have kidney or liver disease taking doxycycline may not be a very good idea, especially if you do not discuss it with your health care provider beforehand. These medical conditions can be important when your dose is being determined. Your doctor will examine you, ask you some questions and then prescribe the dose that you will most likely benefit from. The dose will be based on the examination plus the facts you uniform your health care provider of. This is why it’s so important tot follow all the indications of your health care provider, and this is why you are supposed to follow the recommendations of your doctor rather than those on the label, even if there are discrepancies. If you have liver or kidney disease, you may need a dose adjustment or special tests to safely take doxycycline. Doxycycline is a serious medication that can sometimes cause interactions with other drugs. These interactions can affect the quality of your treatment making doxycycline less efficient or altering the effects it has on you. In order to avoid any unpleasant side effects make sure you always tell your health care provider if you are taking or are planning on taking isotretinoin, minerals, cholesterol-lowering medications, tretinoin, bismuth subsalicylate containing products, penicillin antibiotics, or blood thinners. Please report to your health care provider any other medications you may be taking, even if those are simply herbal supplements. Some drugs can be dangerous to your health if combined with doxycycline and should therefore be avoided.