Thank you for reaching out and joining the conversation. According to the manufacturer site, it says "Continue to take Emgality monthly from the date of your last dose." I'll preface this with please speak with your doctor for complete information as I'm not a medical provider. However, I believe if you took it on 2/28, your next dose would be on 3/28 and so on. I hope that makes sense! I look forward to hearing more from you and wish you a low pain day, Nancy Harris Bonk, Patient Leader/Moderator Migraine.com Team