Careprost, a popular eyelash growth serum, typically begins to show results after about 4 weeks of consistent use. However, full results, including longer, thicker, and darker eyelashes, are usually achieved between 12 to 16 weeks of use. It’s important to apply the serum regularly to maintain these results. If you stop using Careprost, your eyelashes will gradually return to their previous appearance over several weeks to months