I've been getting that the past couple years but not sure if it was from the Diltiazem or from too much sodium. Some days are better than others which is why I suspect plain old fluid retention. By the end of the day, my feet and ankles look like they have little pillows on them. On the very bad days my legs from the knee down look hefty and feel heavy too, like I'm wearing weights on them. But by morning (and several trips to the bathroom at night) things are pretty much back to normal.
Are you limiting your sodium intake at all? I wonder if the combo of the CCB (relaxed blood vessels) and typical diet with a wee bit too much sodium might be the culprit.
That's a very common side-effect for CCBs. My Father's been on a CCB for 22 years, since his heart transplant back in 1988. His feet have been swollen the entire time since. Not too bad, and it hasn't gotten any worse over time. Doesn't bother him much.
All of the CCBs have this side-effect. The reason is that the primary action of CCBs is to relax blood vessels, a.k.a. vascular dilatation (or getting bigger in diameter). Your veins and arteries are larger.
This causes "edema" or water retention in your extremities. The increased blood flow from the CCB causes a pressure increase in the capillaries. This forces more fluid into the surrounding cells, and you swell up.
The more you take the more edema someone might have.
If it were me I'd keep an eye on it, if it gets intolerable I'd try making small dosage changes down until I found the right balance.
I have not heard back from my doctor (or his staff) yet so it seems they are not too worried about it. But then I am now on Medicare and not a big profit patient.
From what I've learned here the swelling may be mostly cosmetic, it doesn't bother me, and if it were winter and I was wearing long trousers I might not even notice.
I think I'll ask for a lower dose on my upcoming prescription refill and see if I can have the benefits without the swelling. I do not take any measures to lower salt, but my wife is a careful cook...then I put salt on vegetables after they are put on my plate.
The side effect sheet that come with the medicine suggest swelling is unusual and worrisome - i.e. a must call your doctor. This is because the instructions associate swelling with an "allergic" reaction. But, as noted in the responses here it is more likely just fluid retention... as said I've been taking the medication (Diltiazem XR Caps 240 mg) for about two months before I even noticed any swelling.
My Diltiazem is only 120 ER. That seems to help the BP, Raynauds and arrhythmias fairly well (when I take it. I've stopped it recently).
Remember, sodium is more than the salt shaker. It sneaks into everything. Prepared foods are the worst. Restaurant food is packed with it. Even natural food like a stick of celery has sodium. For those with CHF, they have to count it all. But the rest of us should at least be aware.
I may try to get the dose level down, it may be a lower dose will do the needed part, heart rate control for me.
I got a telephone call back form my Cardiologist's nurse a few minutes ago, and it seems the answer is "live with it"... keep my feet elevated as much as possible, were support stockings if needed....unless my condition gets worse.
I have an appointment July 21, and my 240 mg prescription has 30 capsules left. I will try to talk my doctor into changing my prescription to 120 mg for my next refill. I'm not sure that will reduce the edema, but it "couldn't hurt"...
I also take 240 mg/daily diltiazem and had the same problem several years ago and my doctor prescribed a minimal dose (25 mg/day) of the diuretic HCTZ to take in addition to the calcium channel blocker. That worked and I hardly notice ankle swelling any more (although my doc and cardiologist still say they see some trace swelling-- but it's not noticeable to the average layman). BTW, the HCTZ also helps control high BP and the diltiazem helps keep my heart rate down in persistent afib.