Hello Diane,
Pains in the knee is not a listed side effect, however muscle pain is a possible side effect of the Cozaar and it is recommended that you let your physician know. You can read all of the possible side effects and drug interactions with Cozaar here.
Online sites are great places to get information to help you manage your health care but can not take the place of your doctor or pharmacist. If you have further questions or think you might need a change in medication, it is best to discuss it with them.
Thanks and take care!
Vicki M
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