Nebulizer for aerosolizing a liquid, the nebulizer comprising: - a reservoir for receiving the liquid to be aerosolized, - a nebulizer body comprising an aerosol-generating system (4; 5, 6) for generating an aerosol and a nebulization chamber for containing the aerosol, and - a detachable cover detachably fixed to the nebulizer body, said detachable cover forming the ceiling of the nebulizer body, and wherein: - the aerosol-generating system (4, 5, 6) comprises a nozzle element comprising a nozzle orifice and a deflector element facing the nozzle orifice of the nozzle element, - the nebulizer body comprises an axially-arranged inner conduit comprising a lower end, - the nebulization chamber is arranged around at least a part of said axially-arranged inner conduit, and - a hollow tubular element comprising a flared-out portion is arranged around the lower end of the axially-arranged inner conduit, said flared-out portion forming a skirt projecting outwardly into the reservoir, said flared-out portion comprising an enlarged diameter that is greater than the inner diameter (d) of the hollow tubular element, said flared-out portion being arranged around the nozzle element comprising the nozzle orifice, said tubular element further comprising a first end and a second end, said tubular element being detachably attached to the axially-arranged inner conduit by the first end and comprises the flared-out portion at the second end, and - the detachable cover comprises a one-way inspiration valve and a one-way expiration valve arranged on said detachable cover for controlling air flows entering into or exiting the nebulizer, and wherein: - the inspiration valve is located so as to face and be in fluid communication with an air inlet of the axially-arranged inner conduit, and is structured so that, in use, it opens only during inspiration phases of the patient, thereby providing an additional flow of air that travels into the inner conduit and then enters into the nebulization chamber thereby "boosting" the nebulization, and - the expiration valve is structured so that, in use, it opens by action of the gases exhaled by the patient. - a reservoir for receiving the liquid to be aerosolized, - a nebulizer body comprising an aerosol-generating system (4; 5, 6) for generating an aerosol and a nebulization chamber for containing the aerosol, and - a detachable cover detachably fixed to the nebulizer body, said detachable cover forming the ceiling of the nebulizer body, - the aerosol-generating system (4, 5, 6) comprises a nozzle element comprising a nozzle orifice and a deflector element facing the nozzle orifice of the nozzle element, - the nebulizer body comprises an axially-arranged inner conduit comprising a lower end, - the nebulization chamber is arranged around at least a part of said axially-arranged inner conduit, and - a hollow tubular element comprising a flared-out portion is arranged around the lower end of the axially-arranged inner conduit, said flared-out portion forming a skirt projecting outwardly into the reservoir, said flared-out portion comprising an enlarged diameter that is greater than the inner diameter (d) of the hollow tubular element, said flared-out portion being arranged around the nozzle element comprising the nozzle orifice, said tubular element further comprising a first end and a second end, said tubular element being detachably attached to the axially-arranged inner conduit by the first end and comprises the flared-out portion at the second end, and - the detachable cover comprises a one-way inspiration valve and a one-way expiration valve arranged on said detachable cover for controlling air flows entering into or exiting the nebulizer, - the inspiration valve is located so as to face and be in fluid communication with an air inlet of the axially-arranged inner conduit, and is structured so that, in use, it opens only during inspiration phases of the patient, thereby providing an additional flow of air that travels into the inner conduit and then enters into the nebulization chamber thereby "boosting" the nebulization, and - the expiration valve is structured so that, in use, it opens by action of the gases exhaled by the patient.