If anti-reflux treatment does not result in a decrease of symptoms, other possible causes should be examined. Over-the-counter medications for neutralizing acids (antacids) and acid suppressants (H-2 blockers) may be used. Antacids are often short-acting and may not be sufficient for treatment. Proton pump inhibitors are an effective type of medication. These should only be prescribed for a set period of time, after which the symptoms should be reviewed. Proton pump inhibitors do not work for everyone. A physical reflux barrier (e.g. Gaviscon Liquid) may be more appropriate for some. Antisecretory medications can have several side-effects. When appropriate, anti-reflux surgery may benefit some individuals. When treating allergic laryngitis, topical nasal steroids and immunotherapy have been found to be effective for allergic rhinitis. Antihistamines may also be helpful, but can create a dryness in the larynx. Inhaled steroids that are used for a long period can lead to problems with the larynx and voice. Mucous membrane pemphigoid may be managed with medication (cyclophosphamide and prednisolone). Sarcoidosis is typically treated with systemic corticosteroids. Less frequently used treatments include intralesional injections or laser resection. Acute laryngitis may persist, but will typically resolve on its own within two weeks. Recovery is likely to be quick if the patient follows the treatment plan. In viral laryngitis, symptoms can persist for an extended period, even when upper respiratory tract inflammation has been resolved. Laryngitis that continues for more than three weeks is considered chronic. If laryngeal symptoms last for more than three weeks, a referral should be made for further examination, including direct laryngoscopy. The prognosis for chronic laryngitis varies depending on the cause of the laryngitis.