Before taking Tamiflu, you must give your complete medical history to the doctor, especially mentioning if you suffer from any autoimmune disease like rheumatoid arthritis, systemic lupus erythematosus, HIV, AIDS, or any disease of the heart, lungs, liver, or kidneys.
Let the doctor know about all the medications [prescription and OTC]-
nutritional supplements-herbal products you are taking, and whether you have any allergies to anything, especially to Oseltamavir, so that the doctor can curtail the use of certain medicines, and prescribe the correct dose regimen for you.
Women who are pregnant, lactating, or plan to have a child, must inform the doctor of their condition, before taking Tamiflu.
Let your treating doctor know if you have fructose intolerance - a condition in which the body is unable to break down fruit sugar [sorbitol] - as Tamiflu suspension contains sorbitol.
Intake of Oseltamivir may cause some people to have hallucinations, nightmares, or they may try to harm themselves. Though this has happened more in children and teenagers, adults also have experienced these symptoms. If a child is being treated with this medicine, then parents have to be alert and watch for these signs.
Tamiflu has not replaced the yearly flu vaccine. If you have taken or plan to take the intranasal flu vaccine, let your doctor know about this, as Oseltamivir can reduce the effectiveness of the flu vaccine if it is taken 48 hours before or 2 weeks after the flu vaccine.
If your flu symptoms remain with you after your course of Oseltamivir is over, contact your doctor.