Mirabegron
Mirabegron is a once-daily tablet for overactive bladder that relaxes the bladder muscle so it holds more urine. PockDose sells generic Myrbetriq 50mg tablets.
When the bladder gives you little warning
A sudden urge that is hard to hold, many more daytime trips than usual, nights broken by getting up, and sometimes a leak on the way to the toilet: together these make up overactive bladder. Adults take mirabegron once a day for it, and the aim is fewer trips and a less insistent urge.
How mirabegron works
The bladder wall contains a muscle, the detrusor, which squeezes urine out and stays relaxed while the bladder fills. Mirabegron is a beta-3 agonist: it switches on beta-3 receptors on that muscle, keeping it relaxed for longer so the bladder can hold more before it signals that it needs emptying. That is a different route from the older antimuscarinic tablets such as oxybutynin and tolterodine, which block acetylcholine; those are more likely to leave you with a dry mouth or constipation.
On a normal morning that comes down to a single 50mg extended-release tablet, swallowed whole with water while the kettle boils. The slow-release design means that one tablet is meant to last all day, so it should not be split or chewed, and a meal neither helps nor hinders it. A day that gets missed is simply skipped, with no doubling up the next. Do not judge it after a few days either: the first week or two will probably feel unchanged, and the benefit builds over the first few weeks.
Side effects and what to watch
Headache, dry mouth, constipation, a cold-like runny nose, urinary tract infection and back pain are the ones people report most. A faster heartbeat and tiredness are also reported. Blood pressure can creep up, so mirabegron is not used when blood pressure is very high and not controlled. A more serious problem is urinary retention — suddenly being unable to pass urine — which is more likely if the bladder already empties poorly. Urgent help is needed if the lips, face or tongue swell or you struggle to breathe.
Mirabegron slows the breakdown of a few other medicines, including metoprolol and flecainide. Some medicines push its own level up in the other direction — ketoconazole, itraconazole, clarithromycin and ritonavir — and the daily dose is then reduced. Digoxin levels can rise as well.
The mirabegron sold here
The mirabegron sold here is Myrbetriq, 50mg extended-release tablets, one of the options in the bladder range. Keep the tablets in their blister pack until you need them, away from damp and heat.
Sources
- Mirabegron: MedlinePlus Drug Information — National Library of Medicine
- Definition & Facts for Bladder Control Problems (Urinary Incontinence) - NIDDK — National Institute of Diabetes and Digestive and Kidney Diseases
Where can I buy Mirabegron in Hong Kong?
Mirabegron can be ordered online with delivery to Hong Kong. The range here is generic Myrbetriq in 50mg tablets. Payment is by Visa, Mastercard or American Express on a secure, encrypted payment page, or by Bitcoin or Ethereum.
How are Mirabegron prices shown?
The price depends on the strength and pack size you choose. The Myrbetriq page shows current prices in HKD or the currency you select.
Do I need a prescription to order Mirabegron?
PockDose does not ask you to upload a prescription when you order mirabegron. See the ordering FAQ for details.
What brand names does mirabegron have?
Myrbetriq is a brand name of mirabegron, which is also sold as Betmiga. Here, mirabegron can be bought online as generic Myrbetriq. These are generics, not the original brand.
How long does mirabegron take to work?
Not on the first tablet. Because it changes how the bladder fills rather than numbing it, most people notice a difference only after a few weeks of daily use, and the effect tends to build over the first month or two.
Can I drink alcohol with mirabegron?
Alcohol is not known to interact with mirabegron, and unlike the older bladder tablets it does not cause drowsiness. Alcohol does make you pass urine more often, though, so a heavy evening can work against the treatment.
Is mirabegron the same as oxybutynin?
No. Oxybutynin and similar tablets are antimuscarinics: they block acetylcholine to calm the bladder. Mirabegron works on beta-3 receptors instead. Both are used for the same symptoms, and mirabegron is often chosen when dry mouth or constipation from antimuscarinics has been troublesome.
Does mirabegron raise blood pressure?
It can, usually by a small amount. Mirabegron is not used when blood pressure is very high and uncontrolled, and if you already take tablets for blood pressure your readings are worth keeping an eye on.
Can I cut the mirabegron tablet in half?
No. The 50mg tablet is extended-release, built to release the medicine slowly across the day. Splitting, crushing or chewing it lets the whole dose out at once, so swallow it whole with a drink.