The purpose of this study is to compare duloxetine with conventional treatment of pain in HIV-1 infected patients.

Among HIV-1-infected patients, diagnosis of fibromialgy has increased over the last years . Appropriate identification of firomialgy in these patients is challenging and sometimes can be more complicated than in HIV-negative population. Concomitant infectious processes and symptoms due to HIV infection itself need to be ruled out before establishing a formal diagnosis.

The treatment of this disease frequently includes muscular relaxants , pain-killers, anti-inflammatories and antidepressives despite no drug is formally indicated for this pathology.

Duloxetine approved indications include both treatment of major depressive disorders (MDD) and diabetic neuropathic pain. Recent studies in HIV negative patients show efficacy to control pain and depressive symptoms in patients with fibromialgy The main purpose of this pilot study is to assess the efficacy of duloxetine in HIV-1-infected patients with fibromialgy.

The main purpose of this pilot study is to assess the efficacy of duloxetine in HIV-1-infected patients with fibromialgy or chronic fatigue syndrome presenting with widespread pain.

Inclusion Criteria:

1. Patients aged 18 years old and more. Age +18 years old.
2. Documented HIV-1-infection.
3. Former diagnosis of fibromialgy.
4. History of good compliance with visit schedule and medication intake.
5. Patients voluntary signed the informed consent.

Exclusion Criteria:

1. Pregnant or breast-feeding females
2. Suspicion of intolerance to duloxetine.
3. History of any clinical condition that, in the Investigator's criteria, could potentially reoccur with the suggested change of therapy (sarcoma, lymphoma, etc).
4. Concomitant condition that could mimic fibromialgy (lupus, endocrine diseases, muscular diseases, multiple sclerosis)
5. or Acute illness within 15 days prior to the inclusion
6. Patients with major depressive disorder with psychotic symptoms, major depressive disorder melancholic type or bipolar disorder. Patients with other depressive disorders can be included (dysthymic disorder and depressive disorder NOS)
7. Anorexia or nervous bulimia
8. History or suspected drug or alcohol abuse.
9. Glaucoma
10. History of heart disease including cardiac arrhythmias
11. Severe obesity (body mass index > 45).
12. Concomitant medication with IMAOS, cimetidine or quinolonas
13. Patients with hepatic or renal serious failure (Creatinin clearance <30 ml/min)
14. Patients with Hypericum perforatum as a concomitant treatment.