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.gov website belongs to an official
government organization in the United States.
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Items most frequently endorsed on the weekly side-effects checklist.
| Item | d-Amphetamine | Modafinil | Modafinil + d-amphetamine | Placebo | Total |
|---|---|---|---|---|---|
| Increase energy | 22 | 10 | 5 | 9 | 46 |
| Changes in sleep patterns | 14 | 6 | 5 | 10 | 35 |
| Anxiety or tension | 10 | 9 | 6 | 8 | 33 |
| Change in sexual performance or desire | 16 | 5 | 6 | 6 | 33 |
| Problems concentrating | 12 | 4 | 7 | 7 | 30 |
