Heart rate increase on sema — May 2025

Just increased from tirzepatide 5 mg to 7.5 mg this week and I'm dizzy ALL THE TIME. Standing up from a chair — dizzy. Getting out of bed — have to sit on the edge for a minute. Bending over to pick something up — whoa. Almost fell in the shower yesterday.

Is this a known thing? It wasn't this bad on 5 mg. Should I call my doctor or is this going to pass? 😵‍💫

What you're describing sounds like orthostatic hypotension — a drop in blood pressure when you change positions (sitting to standing, lying to sitting). There are several reasons this can occur after a dose increase:

1. Dehydration — the most common cause. Reduced food intake means less water from food, and many patients don't compensate with additional fluids. Even mild dehydration drops your blood volume and blood pressure.
2. Reduced caloric intake — eating less at the higher dose means lower insulin secretion and potentially lower blood sugar, both of which can cause lightheadedness.
3. Blood pressure reduction — GLP-1 RAs can lower blood pressure by 2-6 mmHg on average. If you're already on antihypertensives, the combined effect may be too much.

Immediate recommendations:

• Check your blood pressure at home if you have a cuff, especially lying down vs. standing
• Increase fluid intake significantly — 80-100 oz/day, with electrolytes
• Rise slowly — sit on the bed for 30 seconds before standing, stand for 30 seconds before walking
• Make sure you're eating enough — don't skip meals even if not hungry
• If you're on blood pressure medications, contact your prescriber — you may need a dose adjustment

If the dizziness is severe, persistent, or accompanied by fainting, heart palpitations, or chest pain, seek medical evaluation today.

This happened to me going from 5 to 7.5 AND from 7.5 to 10. Both times it was dehydration + my blood pressure meds being too strong.

Before tirzepatide my BP was 148/92 on lisinopril 20 mg. After 3 months on tirz it was 118/74. After the dose increase to 7.5 it dropped to 102/64, and that's when the dizziness started. My doctor cut my lisinopril to 10 mg and the dizziness resolved within days.

If you're on ANY blood pressure medication, this is likely at least part of the issue. Your BP is dropping because you're losing weight and the GLP-1 is having its own mild antihypertensive effect.

Not on BP meds but had the same issue. For me it was pure dehydration. I bought a 40 oz water bottle with time markings on it and I drink two full bottles a day. The dizziness went away in about a week once I was properly hydrated.

Also: salty foods/electrolytes help. Sounds counterintuitive but when your blood pressure is low, sodium helps retain fluid and brings it up. I add a pinch of salt to my water in the morning. My nurse friend confirmed this is legit.

I want to add — check your blood sugar too, especially if you have diabetes or prediabetes. I had dizziness that turned out to be hypoglycemia. My fasting glucose went from 128 pre-treatment to 72 on tirz 7.5 mg, and postprandial was dropping into the 60s. That's too low.

My endocrinologist reduced my metformin dose and the dizziness resolved. GLP-1s can unmask over-medication if you're also on other glucose-lowering drugs.