The patient information leaflet that comes with your medicine will say who should not use it and who should get advice before using it. How to use decongestants This means you'll be given small amounts of pollen as an injection or tablet to slowly build up your immunity to pollen. Hay fever will last for weeks or months, unlike a cold, which usually goes away after 1 to 2 weeks. How to treat hay fever yourself

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For example, taking decongestants alongside some antidepressants can cause a dangerous rise in blood pressure. It's also important to be careful when taking other medicines if you're using an "all-in-1" decongestant remedy.

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Meltzer EO, et al. (2015). Oral phenylephrine HCl for nasal congestion in seasonal allergic rhinitis: A randomized, open-label, placebo-controlled study. This kind of treatment usually starts in the winter about 3 months before the hay fever season begins.

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Signs of sinusitis in young children may also include irritability, difficulty feeding, and breathing through their mouth. Most decongestants can be bought over the counter from pharmacies without a prescription. Who can take decongestants Have you ever felt like your cold won't go away? Nasal congestion that doesn't seem to stop, even with OTC medication, may be due to nasal polyps. READ MORE

antibiotics – if a bacterial infection is causing your symptoms and you're very unwell or at risk of complications (but antibiotics are often not needed, as sinusitis is usually caused by a virus) Sinus decongestants can work to relieve pressure in the upper sinus cavities. If you have ear congestion, relieving this pressure can help manage your pain. But sinus decongestants can’t treat an underlying ear infection. Is it safe to take sinus decongestants while pregnant? More serious side effects can also happen, such as hallucinations and severe allergic reactions (anaphylaxis), but these are very rare. Taking decongestants with other medicines It depends on the active ingredient. OTC pseudoephedrine and phenylephrine should only be taken during pregnancy under your doctor’s supervision. They should not be taken during the first trimester, only after, and even then, only with your doctor’s recommendation. OTC decongestants are not a solution for severe, long lasting sinus infections and chronic allergies. You may need to speak with your doctor about a long-term strategy if you find that OTC decongestants aren’t effectively managing your symptoms.