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janet_gardner2026-04-18

I've been struggling with allergies and a recent cold, I've just started taking Antihistamine D12hr 60-120mg ER Tb. I'm really hoping for some relief from sneezing, runny nose, and itchy eyes. The extended-release formula sounds great for convenience, but I'm a bit worried about potential side effects. Specifically, high blood pressure is a concern for me since the decongestant in it can cause that. Anyone else have experience with this? How has it worked out for you? Any tips on managing potential side effects or advice on what to do if they occur? Also, does anyone know if this medication can cause rebound congestion, like some decongestants can?

1 min read
last active 4/18/2026
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Comments (8)

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katherine_green4/14/2026

Watch out for the high blood pressure side effects. I ended up having to switch back to my old allergy meds because my blood pressure was through the roof. It's not worth the risk if you are already have high blood pressure.

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nancy_santos4/14/2026

I've heard that Antihistamine D12hr 60-120mg ER Tb can cause rebound congestion, but I haven’t experienced it. It’s worth keeping an eye on, though. If you do start to feel more congested, it might be a good idea to talk to your doctor about switching meds.

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russell_castro4/14/2026

If you're worried about side effects, keep a close eye on your heart rate. I noticed mine speed up a bit after starting this, and it was a bit concerning at first.

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nancy_herrera4/14/2026

I've been taking this for a few weeks now and it's been a game-changer for my allergies. No more constant sneezing or itchy eyes! Just make sure to take it with food to avoid any upset stomach.

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scott_sanders4/14/2026

I've just had an awful experience with this. Since i started this medicine, I can't sleep at all. It feels like my body is just wired all the time. The allergy relief is amazing but the side effects make it so I can't take it anymore.

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olivia_quinn4/14/2026

I think my blood pressure went up a bit, but I'm not sure if it was just stress or the medication. I'm definitely keeping an eye on it though. I think it's a good idea to talk to your doctor if you have any concerns about your blood pressure.

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kyle_washington4/14/2026

I've personally found that taking this medication in the morning helps with the insomnia side effect. It gives your body time to metabolize the medication before bedtime. It's worth a try if you're struggling with sleep.

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randy_ramirez4/14/2026

I didn't have high blood pressure before, but my blood pressure started to rise after taking this. I had to switch back to my old meds to keep my blood pressure in check.