Cross-over Study on the Influence of Fampridine on Working Memory in Mild to Moderate Depression

This study is testing whether fampridine — a drug normally used for multiple sclerosis — can improve working memory and thinking skills in people with mild to moderate depression. The trial uses a cross-over design, meaning participants try both the drug and a placebo at different times. **You may be eligible if...** - You are 18–55 years old - You have a confirmed mild to moderate depressive episode (not severe) - Your blood pressure is in the normal range (or well-controlled with medication) - You are fluent in German - Your BMI is between 19 and 34.9 **You may NOT be eligible if...** - You have taken antidepressants or antipsychotics in the past 3 months - You have a history of seizures or conditions that lower the seizure threshold - You have significant kidney problems, heart issues (slow heart rate), or a history of cancer - You have another psychiatric condition such as psychosis, alcohol/drug use disorder, or severe cognitive impairment - You have difficulty walking due to dizziness Talk to your doctor to see if this trial is right for you.