Efficacy and Tolerability of Metamizol in Patients With Episodic Moderate Headache

Inclusion Criteria: * Male and female patients between 18 and 65 years old * Moderate episodic tension headache according to International Headache Society (I.H.S.) classification 2.1 (2.1.1 and 2.1.2) for at least one year * At least two episodes of tension headache per month in the last three months prior to enrolment into this trial * The episodes of tension headaches were usually treated by the patient successfully with a non-opioid-analgesic * First episodic headache occurred at an age under 50 years * Written informed consent according to Good Clinical Practice (GCP) and local regulations * The patient was able to fill in the Patient's Diary Exclusion Criteria: * The patient usually needs for successful treatment of tension headache "Over The Counter" (OTC) analgesic in doses exceeding the doses tested here * The patient takes an OTC-analgesic normally at the first signs of an episode of tension headache * The patient has more than 15 episodes of tension headache per month * Female patients whose episodic tension headache is strongly correlated with the start of hormonal contraception * Concomitant treatment with (non-) prescriptional analgesics * Pre- (less than 4 weeks prior to inclusion in this trial) and/or concomitant treatment with an antidepressive and/or antipsychotic drug * Pre- (less than 2 weeks prior to inclusion in this trial) and/or concomitant treatment with any drug such as NSAIDs (Non-Steroidal Anti Inflammatory Drugs), propanolol, metroprolol, fluna…