Use Piasky (Injectable) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed. If you've been using another drug called eculizumab or ravulizumab, you should receive your dose of crovalimab at the next dose as scheduled with eculizumab or ravulizumab. Crovalimab is given slowly over 60 to 90 minutes as an infusion into a vein on day one. Crovalimab is injected under the skin by a healthcare provider on days 2, 8, 15, 22, and then on day 29 followed by once every 4 weeks. After each infusion, you will be watched closely for at least 1 hour to make sure you do not have an allergic reaction. Doses are based on weight. Your dose may change if you gain or lose weight. You may get infections more easily, even serious or fatal infections. You will need frequent medical tests. Read the Patient Safety Card about serious infections and the symptoms to watch for. Keep this card with you at all times while using crovalimab and for at least 11 months after your last dose. Your infection risk could last for several months after you stop using crovalimab. Some people may have an increased risk of gonorrhea (a sexually transmitted disease). Talk with your doctor about safe ways to keep from getting an infection during sex. Crovalimab can have long lasting effects on your body, even after you stop using this medicine. If you have PNH and you stop using crovalimab, your doctor may need to check your progress for at least 20 weeks after your last dose.