In the field of pharmaceutical science, there is an increasing demand for advanced computational techniques to enhance drug discovery and understand complex molecular interactions. Classical models, despite their strengths, often struggle with complex biological systems and accurate drug predictions. Quantum computing, using qubits that exist in multiple states, processes information at unparalleled speeds. This chapter sheds light on the principles of quantum computing, emphasizing algorithms specifically designed for pharmaceutical applications. These methods signal groundbreaking advancements in drug design, molecular simulation, and drug interaction predictions. Quantum computers have the potential to surpass classical computers in simulating intricate molecules, thus offering more precise drug side effect forecasts. While challenges such as noise and error rates remain, the continuous evolution of quantum technology holds significant potential for breakthroughs in drug discovery and development.