Famciclovir and Heart Palpitations: What Users Say

• Lav...
• September 23, 2017

For Cold Sores "The side effect of heart palpitations was really scary. I could describe it to be like a bad ecstasy pill at a rave. I had to pull the car over, get out, and lie on the side of the road, lasting all up one hour. Other than that... cold sore GONE a day later! Was it worth lying in the gutter for? YES!"

• Hay...
• Taken for less than 1 month
• August 19, 2019

For Cold Sores "Had 2 cold sores on my lip, Dr. and chemist recommended taking Elovax (famciclovir 500 mg) 3 tablet dose. Within 30 minutes of taking it, I started to have severe heart palpitations, severe diarrhea, nausea, and restlessness. After a few hours, I started to get a headache, within 5 hours, my headache had become unbearable and I was rushed to the hospital. Placed on 2 drips and monitored for a few hours. Over the next few days, I am still unwell with stomach pains and a headache. My cold sores did improve BUT NEVER, NEVER AGAIN... DID I MENTION NEVER AGAIN... My experience was awful. I would not recommend taking this medication and wish I hadn't."

• Anonymous
• September 16, 2020

For Cold Sores "First time I took it, I got an intense headache, but I figured it was worth it to prevent a cold sore. But the second time, I had horrible heart palpitations. I felt dizzy and weak, and it was so unpleasant I will never take it again."

• ELO...
• November 9, 2021

For Cold Sores "Took Elovax (famciclovir) one dose. 3 tabs to be taken all at once. I took them for the beginnings of a cold sore that was just starting on my lip. Half an hour after I took them, I had the worst heart palpitations I have ever had. It actually frightened me as my heart rate was incredibly fast. It took a while for it to slow back down. I feel okay now but don't think I will be taking that again."

• Anonymous
• Taken for less than 1 month
• February 4, 2021

For Cold Sores "Gave me heart palpitations."