You must not be given Methylthioninium chloride Proveblue:
- if you are allergic (hypersensitive) to methylthioninium chloride or other thiazine dyes
- if your body does not produce enough of the enzyme G6PD (glucose-6-phosphate dehydrogenase)
- if your body does not produce enough of the enzyme NADPH (nicotinamide adenine dinucleotide phosphate) reductase
- if your blood disorder has been caused by sodium nitrite
- if your blood disorder has been caused by chlorate poisoning.
Special care must be taken with Methylthioninium chloride Proveblue:
- if you have moderate or severe renal disease; lower doses (< 1 mg/kg) may be needed
- if your blood disorder has been caused by a chemical called aniline, which is contained in dyes; lower doses may be needed and total cumulative dose should not exceed 4 mg/kg (see section 3 of this package leaflet)
- if your blood disorder has been caused by a medicine called dapsone (used to treat leprosy and other skin conditions); lower doses may be needed and total cumulative dose should not exceed 4 mg/kg (see section 3)
- if you suffer from hyperglycaemia or diabete mellitus, as these conditions may be worsened by the glucose solution used for the dilution of the medicine
- your urine and stools may turn a blue-green colour; and skin may possibly turn a blue colour when you are treated with Methylthioninium chloride Proveblue. This discoloration is expected and will disappear after the treatment has ended
Monitoring tests
You will undergo monitoring tests during and after treatment with Methylthioninium chloride Proveblue.
If any of the above applies to you, please consult your doctor.
Children
Special care must be taken with Methylthioninium chloride Proveblue:
- in newborns and infants 3 months old or younger, lower doses are recommended (see section 3 of this package leaflet).
Taking other medicines
Please tell your doctor, pharmacist or nurse if you are taking or have recently taken any other medicine, including medicines obtained without a prescription.
You should not be given Methylthioninium chloride Proveblue at the same time you are taking certain medicines to treat depression or anxiety which affect a brain chemical called serotonin. Such medicines include Selective serotonin reuptake inhibitors SSRIs such as citalopram, escitalopram, flouextine, fluvoxamine, paroxetine, setraline and zimelidine bupropion buspirone clomipramine mirtazapine venlafaxine.
However, if the intravenous use of Methylthioninium chloride Proveblue cannot be avoided, you should be administered the lowest possible dose and observed closely for up to 4 hours after administration.
If you have any doubts about whether this medicine should be given to you, consult your doctor.
Pregnancy and breast-feeding
Ask your doctor for advice before you are given this medicine.
The use of Methylthioninium chloride Proveblue during pregnancy is not recommended unless it is clearly necessary, for example in a life-threatening situation.
Due to a lack of available data on whether methylthioninium chloride passes into human breast milk, breast-feeding should be discontinued for up to 6 days after treatment with this medicine.
Driving and using machines
Do not drive or use any tools or machines as methylthioninium chloride has moderate influence on the ability to drive and use machines.