One needs to be aware of these symptoms if they continue because then they need to consult with a doctor right away. Thus, it is better not to buy gabapentin without a prescription, which might result in severe side effects. If one experiences hallucination, depression, or suicidal thoughts, then it calls for immediate medical attention. If you see that your feet or ankle is swelling up quite a lot after taking this medicine, then you need to see your doctor immediately.