Herbal effervescent granules containing fruit extracts of Prunus domestica (plum) and Ananas comosus (pineapple) were formulated and evaluated for laxative and immunomodulatory potential. Extracts were prepared by maceration in 70:30 hydroalcoholic solvent. Three formulation batches (R1, R2, R3) were prepared by the dry granulation (fusion) method using citric acid and sodium bicarbonate as the effervescent couple, mannitol as sweetening diluent, crospovidone as superdisintegrant, and magnesium stearate as lubricant. Phytochemical screening confirmed phenols, flavonoids, alkaloids, carbohydrates, amino acids, and bromelain enzyme. Pre- and post-formulation parameters—angle of repose (25.8°–28.4°), bulk density (0.51–0.55 g/mL), Carr's index (14.5–15.6%), Hausner's ratio (1.17–1.20), pH (5.8–6.3), effervescence time (≤2 min 20 sec), moisture content (