Betahistine complications

It is extremely unusual for betahistine to cause any adverse side effects - it is regarded as a very safe drug. It seems your medical status with heart problems may be playing a roll in what is going on and if your symptoms of bloating and fluid retention persist ask for a fresh cardiac assessment and review of all your medications.

Wow....you certainly have had bad reactions/allergy to Serc.   What dose of Serc were you started on?  Should be 4mg 3X/day...building up gradually to 16mg 3X/day (some folks need even higher dose).  If it was higher than 4mg to start that might explain your terrible reaction. Are you lactose intolerant?  If so, that could be why you are feeling bloated.  Serc contains lactose.  Also, body rash is common for many first time users of Serc/betahistine but usually goes away in a few weeks as your body adjusts to the med. The swelling in your throat and difficulty breathing are obviously the worst and most dangerous side effects and warrant discontinuation.  There are other ways to treat MD vertigo....if you need recommendations let me know and I'll be glad to message you privately. 

Stop taking them and see your GP asap

You can nip chat to the Chemist too but stop them asap

I haven't had any reaction to this med, but it sounds like you may be having some type of allergic reaction which can prove to be dangerous. I think Suzanne has given you the best advice - talk to your doctor and pharmacist to determine what may be causing this and other options if it involves allergic reactions.

Hi Ana, I have also been on a 16mg/3Xday regimen. I did not have any reaction to the meds and as others have mentioned, it sounds like you may be allergic so I'm glad you are following up with your doctor. I have to have the meds compounded and they asked me if I was lactose intolerant due to the capsules they use. However, it took them 5-7 days to compound it. I had a wonderful response to the meds until I ran out before they filled it again, so missing a couple of doses sent my vertigo back into a tail spin. Other things I have tried are prednisone (shot my blood pressure to the moon), steroid shots into my eardrum (first time worked like a dream and worked for a few months but second and third shots also sent me into a tailspin), and last Friday I had a gentamicin shot into my eardrum after a lot of soul searching and prayer. This a more drastic measure because it destroys the nerve endings somehow that cause the dizziness but does not effect hearing (at least not too much more than it already was). He told me I would have a dizzy spell within 24-48 hours and may be fine with the one shot or need another in a month. He said most people have no more symptoms after the second shot, but he has had to give some up to 4 shots each a month apart. I did have a slight dizzy spell yesterday while merging into freeway traffic, but have chalked that up to some stress caused by a sick cat. My energy level is higher, my sleep is better, and overall I feel pretty good. If this doesn't end up working, I will then consider the surgery severing the nerve. I pray that nothing happens to my right ear which is fine right now. But that is in the future. Each of us is different, and if your symptoms are manageable and intermittent so you are not suffering too much, you may not need to take these measures. I suffered 30 dizzy spells from flashes to 3 hour dizziness and nausea from the last steroid shot  in February until I started the betahistine so I really found it intolerable, depressing, and something I felt I had to take the more drastic measures. You are in my thoughts and prayers and I hope to hear soon that you have found something that works for you.