Pregnancy & Birth Clubs <
09/04/2014 at 23:09
How do I work out the dosage again? I'm getting confused with the mg/ml thing!!
O hasn't had his dosage upped for weeks, he is currently on 0.7ml 3 times a day but when he was set on that he was about 5kg. He was weighed today and is 6.75kg so I need to adjust but can't figure out what I'm doing!
09/04/2014 at 23:20
I haven't a clue how its worked out sorry, I always just took A to the docs when I thought hers needed adjusting and got them to work it out!
09/04/2014 at 23:27
When he was first put on it I was trying to syringe if out at 4am with one hand and I knocked over the bottle and lost about 80% of it! I phoned just my GP surgery to ask for a repeat prescription (as it was prescribed by the hospital) at this point O was on 0.266ml 3 times per day. When I picked up the prescription the doctor had it down as 1.2ml 3times a day, so we had gone from less than 1 ml per day to 3.6ml! He clearly had the mg and ml wrong so this didn't fill me with confidence! I worked it out myself after that or had it adjusted at his hospital appointments.
This is a task for tomorrow, I'm off to bed!
10/04/2014 at 06:55
I call my gp and ask them but 1.2 ml 3 times a day sounds quite high? S is on 0.9 x3 a day from when he was 6ish kg and I was told that was the max dose. Is he getting unsettled again? I never adjusted S's unless he started to show signs of getting unsettled again.
10/04/2014 at 10:01
I would give the GP another chance at working it out. I went to S's GP yesterday to confirm what the next dose should be (as he was starting to suffer agein) as I don't feel safe working it out myself! S is 6kg and i wad told that the range is 0.8ml (definitely) to 1.3ml (I think), three times a day. I give S 0.8ml for now. It's interesting though that youve been told 0.9ml is the max, popcorn. Maybe it's the max dose the GP actually wants to prescribe rather than the max amount that the body can physically accept, if that makes sense?
10/04/2014 at 13:21
Hello I am new and don't know about this drug but I am a scientist who works in drug research so I may be able to help you if you are still stuck. If you need help just give me the mg/mL of the solution and the dose you are trying to achieve and the weight of your baby if the dose is weight dependent and I will see if I can figure it out for you.
10/04/2014 at 13:40
I can try and work it out, but need to know the mls/kg.
10/04/2014 at 13:42
I think he's on a 2mg/kg dose which originally worked out at 0.6666, so rounded up to 0.7. In which case if your ranitidine is 150mg/10ml then the new dose would be 0.9mls.
10/04/2014 at 14:12
LLL your a legend! He was about 5kg when he was put on 0.7ml 3 times a day. He's now 6.75kg and our ranitidine is 150mg/10ml (I have no idea what that even means!) so is that still 0.9ml 3 times a day?
10/04/2014 at 18:26
If he was on 0.7 mL of a 150 mg/10mL solution three times a day he was being given 2.1 mL in total which works out to be 6.3 mg/kg/day (150 mg/10mL is 15 mg/mL so 2.1 m/L x 15 mg is 31.5 mg a day which works out to be 6.3 mg/kg if he was 5 kg). Therefore if he is now 6.75 kg he needs 6.75 x 6.3 mg a day which is 42.5 mg. So 42.5/15 (mg/mL) is 2.833 mL in total. 2.83/3 is 0.94 mL three times a day.
So 0.9 mL three times a day is roughly the same dose as he was initially prescribed (very slightly lower). Please note though this is just the maths of a dosing solution I am not a Dr so don't know if you need to adjust the dose for any other reason. Do call a Dr to check this is how we work out doses at work but we are using experimental drugs so can't refer to a medical professional for side effect advise.
10/04/2014 at 19:17
The dose according to the BNFC for 1-6 months is 1-3mg/kg 3 times a day. Which is how we work it out at work.
11/04/2014 at 12:28
And this is why I always just go to the GP! A is on 1.2ml 3 times a day at the moment and has been for quite a while now although I think the doctor said the max dose for his size was 1.4ml x3 so he could have more if he needed it. Once he shows signs of it not working as well - more sick, pain when vomiting - I go and get it reviewed. I'd rather keep him on the minimum dose he needs than try and fail to do the maths myself based on his weight!
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