Bimatoprost is a prescription-only lash growth serum originally developed to treat glaucoma. It is known for enhancing eyelash growth by prolonging the hair growth phase, resulting in longer, thicker, and darker lashes. Bimatoprost is typically applied to the upper lash line and requires consistent use for noticeable results, usually within 8 to 12 weeks. Common side effects may include eye redness, itching, or darkening of the eyelid skin. Due to its medical properties, Bimatoprost should only be used under the guidance of a healthcare professional to ensure safe and appropriate use.