Is hair loss a side-effect of diltiazem ER?

Yes I have been taking it and I have been experiencing a ton of hair loss.

I am currently loosing my hair. I am tired and legs hurt badly almost a stiffness in trying to walk.

Since I have been taking this (May 2018) I am 47, I have extreme hair loss. I reported it to my doctor but he does not think it is connected. I do and extreme neck pain, bad nightmares, increased irritability, (quick to react to others). I really want off this med.

I have lost a lot of hair because of diltiazem. I can't stop taking it. It makes me tired, my legs ache and hair is falling out. I have afib so I need to take it. Life stinks.

Hairloss is not mentioned in the side effects, but my hair is falling out now. Every time I brush my hair, the brush is full of hair. I've been on diltiazem 120mg for three months. I have tachycardia and emphysema, I did not have high blood pressure when I was put on this medication. I've had most of the side effects during the first two months. They have decreased some. Now I have more breathing problems, hair loss, can't sleep at night, and basically been very jittery AND my blood pressure is higher than it was without the pills. I also have swollen feet and legs - started last week. I would like to get off this drug, but I read that once I quit, my heart would quit too. Found this comment on the web. Don't know how true it is.

yes

You can view a list of side-effects for diltiazem here:
https://www.drugs.com/sfx/diltiazem-side-effects.html
Hair loss is not a reported side-effect of diltiazem. See your doctor if the loss of hair is continuing.
See: https://www.drugs.com/health-guide/alopecia-areata.html