A hollow microneedle with a substantially sharp edge is provided that includes at least one longitudinal blade at the top surface or tip of the microneedle to aid in penetration of the stratum corneum of skin. The blade's edge can run the entire length of the microneedle from its very top surface to its bottom surface where it is mounted onto the substrate, or the edge can be discontinued partway down the length of the microneedle. In a preferred embodiment, a three pointed star-shape is used, in which each blade has an isosceles triangular cross-section when viewed from the top of the microneedle. At least one hole through the substrate is located near the side surfaces of the pairs of blades of the solid microneedle.
