{"id":633294,"date":"2025-08-22T15:37:29","date_gmt":"2025-08-22T19:37:29","guid":{"rendered":"https:\/\/www.singlecare.com\/blog\/?p=633294"},"modified":"2025-08-22T15:37:29","modified_gmt":"2025-08-22T19:37:29","slug":"does-losartan-cause-insomnia","status":"publish","type":"post","link":"https:\/\/www.singlecare.com\/blog\/does-losartan-cause-insomnia\/","title":{"rendered":"Does losartan cause insomnia?"},"content":{"rendered":"

Most people taking prescription medications are hoping to improve or resolve symptoms of a particular health condition, not create new ones\u2014but unfortunately, most prescription drugs come with a set of side effects, or adverse drug reactions, that can add to the list of reasons why you\u2019re feeling unwell. One common adverse drug reaction is changes to your sleep habits, and people taking the popular blood pressure medication <\/span>losartan<\/span><\/a>, the generic form of <\/span>Cozaar<\/span><\/a>, may experience this firsthand. Although <\/span>insomnia<\/span><\/a> isn\u2019t considered a common side effect of losartan, it has been reported in clinical trials alongside other nervous system symptoms like drowsiness and headache. Here\u2019s why losartan could be disrupting your sleep, plus how to manage it and when to contact your provider.\u00a0<\/span><\/p>\n

Why is losartan prescribed?<\/span><\/h2>\n

Losartan is a prescription medication typically used to treat high blood pressure, or hypertension. It is also sold under the brand name Cozaar. Losartan is part of a class of drugs called <\/span>angiotensin receptor blockers (ARBs)<\/span><\/a>, which work by relaxing the blood vessels to allow blood to flow more freely. <\/span>Losartan<\/span><\/a> can also be used to treat diabetic nephropathy and heart failure, and to prevent stroke in certain high-risk populations.<\/span><\/p>\n

Does losartan cause insomnia?<\/span><\/h2>\n

For some people, taking losartan affects their sleep patterns and causes insomnia, making it harder to fall asleep, stay asleep, or get enough hours of sleep in total. However, research confirming <\/span>a link between losartan and insomnia<\/span><\/a> is limited.<\/span><\/p>\n

The <\/span>prescribing information for Cozaar (losartan)<\/span><\/a> doesn\u2019t specifically indicate that it can cause insomnia, but it does include sleep disorders as one of a few potential side effects related to your nervous system. That said, sleep disorders are considered a \u201cless common\u201d adverse reaction compared to more common losartan side effects like dizziness and back pain.<\/span><\/p>\n

Some blood pressure medications, like beta blockers, are <\/span>commonly associated with insomnia<\/span><\/a>, but the same effects haven\u2019t been consistently found in people taking other types of blood pressure medications, including ARBs like losartan. Still, some people taking losartan report that the drug causes sleep disturbances.<\/span><\/p>\n

Why might losartan or Cozaar affect sleep?<\/span><\/h2>\n

There are a few reasons why losartan or Cozaar could affect your sleep, including low blood pressure, high potassium, effects on your body\u2019s natural melatonin secretion, and drug interactions.<\/span><\/p>\n

High potassium\u00a0\u00a0<\/span><\/h3>\n

A known side effect of ARBs like losartan is changes to your body\u2019s electrolyte balance, which could trigger painful symptoms that keep you up at night, according to <\/span>Dana Manning<\/span><\/a>, Pharm.D., RD, LDN, associate professor of pharmacy practice at Wilkes University in Pennsylvania.\u00a0<\/span><\/p>\n

One electrolyte in particular, potassium, is linked to muscle soreness and joint aches\u2014and losartan has the potential to <\/span>increase the amount of potassium in your blood<\/span><\/a>, according to <\/span>Roshni Patel<\/span><\/a>, MD, internal medicine provider at Executive Medicine of Texas. Leg, knee, and back pain, as well as muscle pain and weakness, have all been reported as common side effects of <\/span>losartan<\/span><\/a>.<\/span><\/p>\n

Melatonin changes<\/span><\/h3>\n

There is also a small amount of research suggesting that losartan can change the way your body makes <\/span>melatonin<\/span><\/a>, a hormone that maintains your circadian rhythm and helps you sleep. A <\/span>2014 animal study<\/span><\/a> found that losartan decreased melatonin production and also altered when melatonin was released. Although the study of losartan\u2019s effects on melatonin has been limited to animals, Dr. Patel says she has personally seen a link between losartan and insomnia in her own patients.<\/span><\/p>\n

Low blood pressure<\/span><\/h3>\n

Another possible cause of losartan insomnia is <\/span>low blood pressure, or hypotension<\/span><\/a>. Your <\/span>blood pressure often drops<\/span><\/a> at night while you sleep, and losartan can increase this effect since it\u2019s designed to lower your blood pressure. <\/span>Low blood pressure<\/span><\/a> can cause headaches, nausea, and dizziness, which may make it difficult to fall or stay asleep.<\/span><\/p>\n

Drug interactions<\/span><\/h3>\n

Losartan can interact<\/span><\/a> with some other medications and substances, and taking it with these other drugs may increase the chances of insomnia. Combining losartan and diuretics, for example, can raise your blood potassium levels and cause sleep-disrupting muscle or joint pain. Drinking alcohol while taking losartan may contribute to low blood pressure and increase symptoms like dizziness.<\/span><\/p>\n

Common losartan side effects<\/span><\/h2>\n

While you may or may not experience losartan insomnia, there are some more <\/span>common side effects<\/span><\/a> you should be aware of when taking losartan for high blood pressure, including an increase in upper respiratory infections, dizziness, back pain, and cough. People taking losartan for diabetic nephropathy may also experience diarrhea, fatigue, low blood sugar, and other symptoms.<\/span><\/p>\n

Losartan is usually tolerated well by most people taking it, but there is also the potential for serious side effects, including dangerously low blood pressure, kidney damage, muscle damage, and irregular heartbeat.<\/span><\/p>\n

Tips for better sleep while taking losartan<\/span><\/h2>\n

If you\u2019re struggling with insomnia while taking losartan, you may be able to manage it with a few lifestyle changes that allow you to continue taking your medication:\u00a0<\/span><\/p>\n