Sprague–Dawley rats were orally administered SCN suspensions and SCN nanoparticles. The drug concentration percentage was read as previously described. At regular intervals of 0.5 hours, 1 hour, 4 hours, 6 hours, 8 hours, and 12 hours, the mucoadhesiveness of the particles was studied in vivo. The results revealed that the percent of SCN nanoparticles retained in the stomach was significantly higher than the percent of SCN suspension retained (), likely due to the narrow particle size of the prepared nanoparticles.The polymer was deep inside the nanoparticles and had swollen into a large mass of polymers at a pH level of 1.2 (swelling behavior). As such, a large surface area had formed, and the interaction between the nanoparticle and mucin was conducive to prolonged residence in the gastrointestinal tract. Another reaction that favors adhesion is hydrogen bonding [11, 28]. The chitosan polymers primarily adhered due to the hydrogen bond, the hydrophobic interactions with gastric mucin, the presence of amino groups, and electrostatic forces. The release percentage of SCN after 30 minutes was 29.1%, while at 1 hour it was 40.1%, at 4 hours it was 59.7%, at 6 hours it was 83.7%, at 8 hours it was 86.4%, at 10 hours it was 98.1%, and at 12 hours it was 98.4% (Figure 7). The percentage of the pure drug released after 30 minutes was around 40.32%, and after 1 hour it was 86.9%. Additionally, the SCN nanoparticles exhibited 29.1% drug release in 30 minutes, which means that a significant amount of SCN was weakly bound to or adsorbed on the surface of the nanoparticles. This is likely due to an “initial rapid release” and supports the notion that the formulation exhibits rapid and significant therapeutic effects on patients in clinical settings. When compared with the pure drug, the SCN nanoparticles showed a sustained release pattern.