Solo 650mg is a brand of paracetamol, which is a commonly used pain reliever and fever reducer. In general, taking two tablets of Solo 650mg at night should not cause any serious problems, as long as you do not exceed the recommended daily dose of 4 grams (8 tablets) per day.
However, taking more than the recommended dose of paracetamol can cause
liver damage, especially if taken over a long period of time or in combination with alcohol. Symptoms of liver damage may include nausea, vomiting, abdominal pain, and yellowing of the skin and eyes.
In my opinion, it would be best for you to avoid taking more than the recommended dose of paracetamol in the future. If you experience any concerning symptoms, such as severe abdominal pain or yellowing of the skin and eyes, you should seek medical attention immediately.
Next Steps
As for the next steps, I would advise you to follow the recommended dosage instructions on the label of any medication you take in the future, and to consult with a doctor or pharmacist if you have any questions or concerns.