There is no absolute which side effect is less between Timosartan and Olmesartan, drug side effects vary from person to person. For people with liver and gallbladder diseases, the side effects of Timosartan are greater. For people with poor gastrointestinal function Olmesartan side effects are greater, need to be analyzed specifically. 1. Timosartan: Timosartan is a long-acting antihypertensive drug, which maintains its antihypertensive effect for a longer period of time and is suitable for people who need to lower their blood pressure for a long time. However, Timosartan is mainly excreted through the biliary tract, which is prone to damage the liver, gallbladder and other organs. Therefore, for people with poor liver and gallbladder function, Timosartan has more side effects and should be used with caution. 2. Olmesartan: Olmesartan can be metabolized not only by the liver, but also by the kidneys, which has relatively fewer side effects on people with insufficient liver and kidney functions. However, olmesartan is prone to malabsorption in the small intestine, and is more likely to cause gastrointestinal diseases such as diarrhea, so for people with poor gastrointestinal function, olmesartan side effects are greater. The above drugs need to be used under the guidance of a doctor, do not blindly use drugs on your own, so as not to cause adverse consequences.