Yes, the symptoms you are experiencing may be related to Lipvas 20 (Atorvastatin). Muscle pain, especially in the legs, is a common side effect of statin medicines. Some people may also develop stomach discomfort, loose motions, or frequent bowel movements while taking this medicine. Since your symptoms started after using the tablet for about one month, it is important to discuss them with your doctor. Most side effects are mild, but muscle pain should not be ignored, especially if it becomes severe or is accompanied by weakness, tiredness, or dark-coloured urine. These may rarely indicate muscle damage caused by the medicine. Stomach pain and bowel changes may also occur due to irritation of the digestive system. Do not stop the medicine suddenly without medical advice, because a cholesterol level of 400 is very high and needs proper treatment. Your doctor may suggest blood tests to check liver function and muscle enzymes, and may reduce the dose or change the medicine if necessary. Drink plenty of water, avoid alcohol and oily foods, and continue a healthy diet and regular exercise.