Pharmaceutical liquid dosage forms are solutions intended for oral consumption, topical application, or intravenous administration. These formulations consist of a blend of active pharmaceutical ingredients and excipients, offering rapid onset of action and optimal therapeutic outcomes for specific patient groups. Thus, they are vital for the treatment and management of a range of medical conditions across the world. Even though the global population is aging and more patients are experiencing difficulties with swallowing, there remains a lack of commercially available oral liquid medications for both elderly and pediatric patients. The pharmaceutical industry has made extensive use of liquid dosage forms; these applications range from oral preparation and injection through the vaginal, optic, nasal, and rectal formulations. This chapter describes the various kinds of their distinct components and discussing their primary characteristic. A succinct summary of the most common ways to get ready has been incorporated, in addition to the vital physical characteristics that must be taken into account when creating them. In particular, emphasis has been provided to their implementation via several administration channels. This guide provides an overview of quality control (QC) processes essential for ensuring the safety, efficacy, and consistency of liquid dosage forms in pharmaceuticals. It outlines critical aspects such as raw material selection, formulation development, manufacturing practices, and testing methods.