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Gallium (Ga) and Ga-based liquid metal (LM) alloys offer low toxicity, excellent electrical and thermal conductivities, and fluidity at or near room temperature. Ga-based LM particles (LMPs) synthesized from these LMs exhibit both fluidic and metallic properties and are suitable for versatile functionalization in therapeutics. Functionalized Ga-based LMPs can be actuated using physical or chemical stimuli for drug delivery, cancer treatment, bioimaging, and biosensing. However, many of the fundamentals of their unique characteristics for therapeutics remain underexplored. We present the most recent advances in Ga-based LMPs in therapeutics based on the underlying mechanisms of their design and implementation. We also highlight some future biotechnological opportunities for Ga-based LMPs based on their extraordinary advantages. The surface tension of gallium (Ga)-based liquid metals (LMs) can be broken using mechanical and chemical means, and smaller Ga-based LM particles (LMPs) can be constructed. Ga-based LMPs offer both fluidic and metallic cores and peculiar interfacial properties, which differ fundamentally from the properties of solid metal particles. Ga-based LMPs hold great potential for therapeutics. Functionalized Ga-based LMPs can be designed and activated for drug delivery, cancer treatment, bioimaging, and biosensing on stimulation by light, electromagnetic fields, mechanical means, or chemical reactions. Fundamental understanding of the effects of Ga-based LMPs' surface oxides, their interactions with cells and their organelles, and their specific alloy composition with other elements should be further explored to expand the horizons of therapeutics using LMPs. [ABSTRACT FROM AUTHOR]