| Tier | Agent | Best For |
|---|---|---|
| 1st Line | Amitriptyline | Sleep + fatigue + diffuse pain |
| 1st Line | Duloxetine | Pain + depression/anxiety |
| 1st Line | Pregabalin | Pain + sleep + neuropathic features |
| 2nd Line | Cyclobenzaprine / Gabapentin | Sleep / neuropathic overlay |
| Caution | Tramadol (short course only) | Severe acute flare — never with SNRIs |
| Response | Definition | Next Step |
|---|---|---|
| Good | ≥30% FIQ-R improvement | Monthly physio × 3 months, then quarterly |
| Partial | 10–29% improvement | Extended 4-week program or psychology referral |
| Non-response | <10% improvement | Intensive pain program + medication review |