I’ve had RLS for years. I’ve been a poor sleeper since childhood.  I’m 74 years old now. In my 50s I had an Afib (Atrial Fibrillation) episode. Extensive testing at the university of Michigan showed a healthy heart with a slightly leaky valve. I was put on the lowest dose extended release beta blocker (metropolol succinate) and the lowest dose ARB, Losartan.  The beta blocker was to keep my heat rate down and the losartan for BP management.  I’ve only had one other afib episode since, again caused after a very stressful situation which had preceded my first afib episode. I get occasional PACs and PVCs and occasional very short runs of supraventricular tachycardia. The tachycardia seems to run in my family. My grandmother, mom, brother, son and I all have episodes. My electrophysiologist says it’s minor and not to worry.
Okay, so all this to lead into something that I only realized this year. I take the beta blocker in the morning and losartan in the evening, around 5 PM. Every evening after sitting down for dinner, the RLS would start in, in earnest. I set up a standing area in the den to read and use my iPad and often I was standing for hours or walking around and stretching my legs and back before going to bed between 1 and 3 AM, doable only because I’m retired and can sleep whenever and however I want. I have a spinal issue so I use an indoor rollator a lot and an all terrain rollator outdoors and a cane sometimes, etc.  I’m active despite my back/spine issues. So I was always so discouraged that when I finally went to relax after dinner, I couldn’t.  Only last month did i think to see if RLS could be a side effect of Losartan and it is! I couldn’t believe it. Fortunately I had my yearly meet up with my electrophysiologist in about a week after. I researched most prescribed BP meds and they are Lisinopril (ACE Inhibitor) and Losartan (ARB). I did not see RLS as a side effect of Lisinopril so I asked my doc if I could substitute and he agreed: 5 mg of Lisinopril for the 25 mg of Losartan.  Within days, I could sit and knit and watch TV with my husband after dinner.  I do still get RLS but it’s at least 75-80% less and not as severe. I’m so very pleased. Any relief is relief. Now if I can resolve my sleep issues next, I’ll be a happy camper. I’ve tried gabapentin and even low doses leave me loopy the next day so that’s out. I’ve tried gummies and capsules of CBD, with no THC and with low THC, also of no helps. I get some help with magnesium glycinate and discovered that it’s the glycine apparently that helps sleep. Using Consumer Lab vetting (I’m a member), I bought a small mount of glycine powder to mix in (3 mg; 1 teaspoon) water to take with my magnesium (~500 mg). I’ve just started it and no change but I’ll give it a whirl for awhile.
I’m going to steal a bar of my husband’s Irish spring soap to put under my mattress pad tonight and maybe I’ll put on the compression “sleeves” that I wear during winter months during the day, They are so much easier to put on and take off than stockings and I can wear my wool socks with them in the winter. I won’t wear socks in bed though. Any additional help with RLS will be appreciated. I also get the occasion leg cramps so if these things help with those too, yay! 
I wrote this tome in case anyone else out there is taking Losartan and it might be exacerbating their RLS issue. Good luck to us all!
       
Hi Nanci: I've had RLS since 2010, but it was only diagnosed in 2020. My symptoms and the descriptions of RLS I read didn't match. My RLS presents as an unbearable achy pain. I used to not twitch at all--I do now, but not as a major feature. According to my sleep neurologist (an expert treating RLS) many medications do make RLS worse. (One reasons to seek treatment from an expert on RLS---this is not information our primary care doctors seem to have). RLS originates from something neurologically amiss in the brain. I like to think of it like having a seizure--nothing my behavior can control (entirely). I spent years trying to figure out "cause and effect" and then moved on and realized I'm blameless--and, unfortunately, also helpless (without my RLS expert doctor.) Currently, my symptoms are very well controlled. I even have many nights without any symptoms, at all. Previously, I had 1 to 4 episodes every night. Maybe I had a night without symptoms every 3-4 months as an oddity. I am now a long way from 2020, when I developed insomnia and cried for hours and realized death would be an improvement. #1 I take Rx buprenorphine every night. #2. I use a massager on my legs when symptoms start. Before the medication, the massager was a mainstay and helpful. I would wake, feel the RLS pain start, use the massager, which "confused" my nerves and turned off the pain (until 2020, when it stopped being effective). #3 I got an insurance (medicare) paid for Niadra--device for RLS made by the Noctrix Company. This is a relatively new option. It is a pair of bands, worn on both legs below the knee that works kind of like a TENS unit--you turn it on and it makes a brain distracting "buzzing" that turns off the RLS symptoms. Unlike the massager, which needs to be hand-held, the Niadra can be used as I fall back to sleep. And I do. Unfortunately, it is not yet available in all states. Also, it doesn't help when my symptoms are most horribly severe, but it is very helpful for mild to moderately severe. BTW, my RLS is mostly on the side and back of my left thigh and sometimes both thighs and up through my buttocks. I've grown to understand it can present any place, including arms. Like you, I have had late afternoon and early evening RLS (sitting in a chair or lying on the sofa, trying to watch TV). The Niadra has been really great, dissolving the pain during these times. Although it may not be an immediate option for you, it is something to know about and keep in mind. There is no cure for RLS. It's about lifetime management and we need all the tools available to manage it! Google the Noctrix company. My advice is to advocate for yourself by first of all finding and making an appointment with a RLS specialist. A real expert. There is a RLS Foundation, so you could ask for recommendations through them. Google their website. My doctor does telemedicine in Ohio, Florida and Michigan, if you live in any of those states. I don't, but I travel to Ohio to connect with him. I've read in this forum that there is wonderful an expert at Mayo who also prescribes buprenorphine. Stanford (in California) has experts. Mass General in Boston has a number. Dr Early in Baltimore at Johns Hopkins (but he will only see Maryland residents). It takes time to get any appointment with someone "good" but you don't want someone pushing Requip on you (because it leads to augmentation--a worsening of symptoms). I was in crisis when I was motivated to find a good doctor and it took 3 months for my first appointment. A miserable 3 months. Please keep us updated!