Always ask your physician whether a given medication is suitable for inhalation. He or she knows your diagnosis and will perscribe the right medications and dosage you need. Your chemist can also answer some questions about your medications. In general the following applies: given the enormous number of inhalation solutions that are available commercially for the treatment of various respiratory diseases, it is not possible to make any specific recommendations here. Your physician will make decisions regarding your treatment. The following are entirely unsuitable for inhalation with these devices: cough syrups, mouth rinses, balsam preparations or drops that are used as embrocations or with hot water as a "vapour bath". Essential oils or similar products are also unsuitable. Products of this kind are often sticky and viscous; they may impair the function of the device permanently (e. g. by clogging the nozzle). Moreover, many of these products contain essential oils, which can trigger an acute bronchial spasm (a sudden, involuntary constriction of the bronchial system accompanied by shortness of breath), similar to the effect of inhaling hypotonic solutions (e. g. distilled water).