Open Access Research Paper Views (1291) Formulation and in-vivo evaluation of theophylline transdermal patch JA. Avbunudiogba, E. Agbamu, BB. Iwetan, T. Obavwonovwe, AO. Ifie Int. J. Biosci. 21(3), 215-222, September 2022. DOI: http://dx.doi.org/10.12692/ijb/21.3.215-222 Keywords: Delivery, HPLC, Theophylline, Transdermal patch Details