Medicines may be needed when symptoms of sinusitis are severe or do not improve. The goals of treatment with medicine are to: Treat the infection, which is usually caused by bacteria if your symptoms have lasted more than 7 to 10 days. Relieve pressure and pain caused by poor sinus drainage.
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Itâs important to be careful when taking any type of drug. Nitrous oxide affects everyone differently, based on: 1  The amount taken. 2  Size, weight and health. 3  Whether the person is used to taking it. 4  Whether other drugs are taken around the same time.