Hi, Myolgin is a combination medication that contains paracetamol, caffeine, and orphenadrine. Paracetamol is used to relieve pain and reduce fever, while caffeine is a mild stimulant that helps to enhance the effectiveness of paracetamol. Orphenadrine is a muscle relaxant that is used to treat muscle spasms and stiffness. Headache is a potential side effect of myolgin. The headache you are experiencing may be a side effect of the medication. Other potential side effects of myolgin include dizziness, dry mouth, blurred vision, difficulty urinating, and allergic reactions. It is also possible that the headache you are experiencing is related to the injury you sustained when you fell. Headaches can be a common symptom of head injuries, and it is important to follow up with your doctor if your headache persists or worsens. If you continue to experience headaches after taking myolgin, you should speak with your doctor about alternative treatment options. They may recommend adjusting the dose or frequency of myolgin, or may suggest a different medication altogether. Additionally, if your headache is related to your injury, your doctor may recommend further evaluation or imaging to ensure that there is no underlying damage or issue. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician