Nasal spray efficient way of transporting drugs with potential use in crossing the blood–brain barrier. Antihistamines work by competing for receptor sites to block the function of histamine, thereby reducing the inflammatory effect. Antihistamine nasal sprays include: Corticosteroid nasal sprays can be used to relieve the symptoms of sinusitis, hay fever, allergic rhinitis and non-allergic (perennial) rhinitis. They can reduce inflammation and histamine production in the nasal passages, and have been shown to relieve nasal congestion, runny nose, itchy nose and sneezing. Side effects may include headaches, nausea and nose bleeds. Corticosteroid nasal sprays include: Influenza vaccine is available in the form
Nasal consonant vowels, resulting in and . What would be coda nasal occlusives in other West Iberian languages is only slightly pronounced before dental consonants. Outside this environment the nasality is spread over the vowel or become a nasal diphthong ("mambembe" , outside the final, only in Brazil, and "mantém" in all Portuguese dialects). The Japanese syllabary kana ん, typically romanized as "n" and occasionally "m", can manifest as one of several different nasal consonants depending on what consonant follows it; this allophone, colloquially written in IPA as , is known as the moraic nasal, per the language's moraic structure. Welsh has