If you have forgotten to take your citalopram for several days, it is generally recommended to wait until your usual time or the next dose before continuing the treatment. It is important to be mindful of missed doses to avoid potential side effects from abruptly stopping the medication. Setting reminders or incorporating the medication into your daily routine can help reduce the likelihood of forgetting. If you experience side effects after restarting the medication, consider starting with a lower dose and consulting with a pharmacist for guidance.