1. Regulatory Hurdles: Nano drugs often face stringent regulatory scrutiny due to their novel nature. Establishing clear guidelines for their approval can be challenging. 2. Manufacturing Complexity: Producing nanoparticles with consistent size, shape, and functionalization at a large scale is technically demanding. 3. Potential Toxicity: The long-term effects and potential toxicity of nanoparticles themselves are not fully understood, necessitating extensive research and testing.
