Corticosteroids can be administered through various means, such as oral ingestion, injection into veins, joints or muscles, and topical application to the eyes or skin. Although they have proven to be beneficial, their usage is often limited to avoid potential severe side effects. Syrups or tablets are common oral forms of steroids and are used to treat allergies, asthma, infections, blood disorders, and certain cancers. Prednisone is one example used to prevent organ rejection in transplant patients. Steroid injections can be used locally to alleviate pain and inflammation in joints, muscles, and blood vessels, and are effective treatments for conditions such as joint pain, sciatica, and arthritis. Hydrocortisone and methylprednisolone are examples of steroid injections that doctors can prescribe. Steroid inhalers allow patients to inhale medication to treat conditions like COPD or asthma by reducing inflammation in the airways and lungs to enhance breathing. Topical steroids in the form of creams or ointments are used to treat skin conditions such as dermatitis, psoriasis, and eczema. Hydrocortisone cream is an example of an over-the-counter topical steroid. In addition, steroid nasal sprays are used to treat nasal congestion, sinusitis, non-allergic rhinitis, nasal polyps, and hay fever. Fluticasone and beclomethasone are some common examples of nasal sprays.