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There is usually no need or use in taking any medication before you have actually been infected with a disease; in fact in many cases, this is harmful, as it ultimately reduces the efficacy of the medicine, making treatment more difficult when you finally do contract the disease. The only "treatment" that can be given before one contracts a disease is a vaccination. In your case, you will anyway not really be taking the medication "before hand" - the appearance of symptoms indicates that you already have the disease, and is not to be understood as a warning for the future. Vaccination is useless once the disease has already taken hold, and at this point the disease cannot be prevented, only treated.
However, that said, it is always best to let a doctor diagnose your symptoms, as many diseases have very similar symptoms. A patient diagnosing his or her symptoms is quite likely to jump to conclusions without adequate knowledge and experience. In any case, there is no real treatment for measles, and the main thing you need to do if you have measles is to rest for the next few days. At the most, you may take some over the counter medication to bring down the fever. Secondary infections can however develop in the presence of measles, and these will need to be treated, which is another reason to let a doctor treat you.
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