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Development of botulinum toxin A-coated microneedle for treating palmar hyperhidrosis.

Hyperhidrosis is a disorder that produces excess amount of sweat. The botulinum neurotoxin A (BoNT/A) has been used to treat hyperhidrosis through multiple intradermal injections at the site of condition. However, due to its toxicity, it is important to precisely deliver the proper dose of toxin to the target site. In addition, the use of conventional hyperdermic needle for multiple injections in the palm makes the approach undesirable and painful. Here, we designed a BoNT/A-coated microneedle (BoNT-MN) array and tested its efficacy as a substitute pain-free method to treat hyperhidrosis. BoNT-MNs were prepared by coating BoNT/A formulation on poly-lactic acid microneedles and were found to successfully penetrate in vitro thick skin. The coating formulations were then tested for its stability at 4°C, 25°C, and 37°C for 24 h. BoNT-MNs were found to be much more stable than its liquid state. Additionally, we carried out in vivo experiments by treating the right paw of mice with BoNT-MNs and found that the treatment induced a significant reduction of sweating response in the mouse's foot pads. Thus, BoNT/A treatment with microneedles is beneficial and may be used as a more efficient and less painful approach to treat hyperhidrosis.