The most common side effects of losartan include:

• Feeling dizzy
• Headaches
• Unusual muscle pain, weakness, or tiredness
• Nasal congestion
• Upper respiratory infection
• Blurred vision
• Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• Confusion
• Black, tarry stools

Its important to note that while these side effects are common, not everyone experiences them. If any of these side effects persist or become bothersome, it is advisable to consult a healthcare professional for guidance. Additionally, serious side effects such as a rash thats swollen, raised, itchy, blistered, or peeling, or any signs of a serious allergic reaction should prompt immediate medical attention.