A dry powder inhaler configured to deliver a first powder medicament and a second powder medicament different from the first powder medicament, the dry powder inhaler comprising: a blister pack; and a medicament delivery assembly, wherein the blister pack comprises: a strip in which blister pockets (12A, 12B) are defined, said first and second powder medicaments being contained within the blister pockets (12A, 12B), wherein a series of blister pockets (12A, 12B) is defined in the strip, the series extending linearly along the length of the strip, wherein the first and second powder medicaments are respectively contained in consecutive blister pockets (12A, 12B) of the series, such that the blister pockets containing the first powder medicament alternate with the blister pockets containing the second powder medicament along the length of the strip, wherein the blister pack further comprises a peelable cover for covering the blister pockets (12A, 12B), wherein the blister pockets (12A, 12B) are defined in a base layer, and wherein the peelable cover is releasably adhered to the base layer between the blister pockets (12A, 12B), and wherein the medicament delivery assembly is configured to: access the blister pockets (12A, 12B) and permit a subject to inhale the first and second powder medicaments therefrom, wherein the medicament delivery assembly is configured to permit the subject to inhale the first and second powder medicaments simultaneously, the medicament delivery assembly being configured to access consecutive blister pockets (12A, 12B) for each inhalation using the inhaler, wherein the medicament delivery assembly comprises a peeling mechanism configured to peel the cover covering a pair of consecutive blister pockets (12A, 12B) thereby to expose the first and second powder medicaments for each inhalation using the inhaler, and wherein the medicament delivery assembly is configured to advance the blister strip by pulling or by pushing the blister strip. a blister pack; and a medicament delivery assembly, wherein the blister pack comprises: a strip in which blister pockets (12A, 12B) are defined, said first and second powder medicaments being contained within the blister pockets (12A, 12B), wherein a series of blister pockets (12A, 12B) is defined in the strip, the series extending linearly along the length of the strip, wherein the first and second powder medicaments are respectively contained in consecutive blister pockets (12A, 12B) of the series, such that the blister pockets containing the first powder medicament alternate with the blister pockets containing the second powder medicament along the length of the strip, wherein the blister pack further comprises a peelable cover for covering the blister pockets (12A, 12B), wherein the blister pockets (12A, 12B) are defined in a base layer, and wherein the peelable cover is releasably adhered to the base layer between the blister pockets (12A, 12B), and a strip in which blister pockets (12A, 12B) are defined, said first and second powder medicaments being contained within the blister pockets (12A, 12B), wherein a series of blister pockets (12A, 12B) is defined in the strip, the series extending linearly along the length of the strip, wherein the first and second powder medicaments are respectively contained in consecutive blister pockets (12A, 12B) of the series, such that the blister pockets containing the first powder medicament alternate with the blister pockets containing the second powder medicament along the length of the strip, wherein the blister pack further comprises a peelable cover for covering the blister pockets (12A, 12B), wherein the blister pockets (12A, 12B) are defined in a base layer, and wherein the peelable cover is releasably adhered to the base layer between the blister pockets (12A, 12B), and wherein the medicament delivery assembly is configured to: access the blister pockets (12A, 12B) and permit a subject to inhale the first and second powder medicaments therefrom, wherein the medicament delivery assembly is configured to permit the subject to inhale the first and second powder medicaments simultaneously, the medicament delivery assembly being configured to access consecutive blister pockets (12A, 12B) for each inhalation using the inhaler, wherein the medicament delivery assembly comprises a peeling mechanism configured to peel the cover covering a pair of consecutive blister pockets (12A, 12B) thereby to expose the first and second powder medicaments for each inhalation using the inhaler, and wherein the medicament delivery assembly is configured to advance the blister strip by pulling or by pushing the blister strip. access the blister pockets (12A, 12B) and permit a subject to inhale the first and second powder medicaments therefrom, wherein the medicament delivery assembly is configured to permit the subject to inhale the first and second powder medicaments simultaneously, the medicament delivery assembly being configured to access consecutive blister pockets (12A, 12B) for each inhalation using the inhaler, wherein the medicament delivery assembly comprises a peeling mechanism configured to peel the cover covering a pair of consecutive blister pockets (12A, 12B) thereby to expose the first and second powder medicaments for each inhalation using the inhaler, and wherein the medicament delivery assembly is configured to advance the blister strip by pulling or by pushing the blister strip.