Method development and method validation of guaifenesin and dextromethorphan by RP-HPLC. Int. Jrnl. Res. Pharm. Chem. & Analy [Internet]. 2018 Dec. 11 [cited 2025 Sep. 6];1(1):18-24. Available from: https://rubatosis.org/journals/index.php/ijrpca/article/view/93