Inside, on an empty stomach, at least 30 minutes before or 2 hours after meals, necessarily mixed with antacids, containing aluminum and magnesium hydroxides.
The recommended daily dose depends on the body weight.Powder is taken 1 or 2 times a day (see table). With a two-time dose, the interval between doses should be 12 hours.
Adults
Body mass | Dosing regimen |
>60 kg | 400 mg once a day or 200 mg 2 times a day |
<60 kg | 250 mg once a day or 125 mg 2 times a day |
Children
Calculation of body surface area - for children immediately after birth:
Newborns and children under 8 months: daily dose - 100 mg / m2 twice a day with an interval of 12 hours.
Children older than 8 months: daily dose - 120 mg / m2 twice a day at intervals 12 hours.
Before the first appointment, the doctor prepares the drug solution, teaches the patient (or the child's parents) how to prepare the solution, determines the exact dose for the specific patient, depending on the type of antacid, concomitant therapy, etc. A suitable syringe can be used to dispense the prepared drug solution.
Instructions for preparation of the drug solution in mixture with antacids
In the table below, antacid preparations are divided into three groups (A, B and C), depending on the content of active substances in them. The left column of the table indicates the magnesium hydroxide content in mg per 5 ml of the preparation, in the middle column - the amount of aluminum hydroxide that should be contained in the preparation,the right column indicates the group to which the antacid drug belongs.
The content of magnesium hydroxide *, mg / 5 ml. | Aluminum hydroxide content, mg / 5 ml (**). | The ruppa, to which the antacid drug belongs. |
400 | 400 to 900 | A |
350 | 425 to 900 | A |
300 | 450 to 900 | A |
|
250 | 200 to 450 | AT |
200 | 213 to 450 | AT |
150 | 225 to 450 | AT |
|
125 | 100 to 225 | FROM |
100 | 107 to 225 | FROM |
75 | 113 to 225 | FROM |
Before preparing the solution, you should determine to which group of antacid preparations the drug at your disposal belongs.
* If the magnesium hydroxide content falls between these values, it is possible to apply the drug when the minimum content of aluminum hydroxide compensates for the reduced magnesium hydroxide content.
EXAMPLES:
1. If the preparation contains 325 mg of magnesium hydroxide and a sufficient amount of aluminum hydroxide, the preparation belongs to group A. The minimum aluminum hydroxide content is calculated as follows: a decrease in the magnesium hydroxide content by 1 mg requires an increase in the aluminum hydroxide content by at least 0.5 mg. In our example, reducing the magnesium hydroxide content by 75 mg (from 400 mg to 325 mg) requires a minimum increase in the aluminum hydroxide content by 37.5 mg (if rounded off - by 38 mg).Therefore, the content of aluminum hydroxide in the preparation should be at least 438 mg.
2. If the preparation contains 175 mg of magnesium hydroxide and a sufficient amount of aluminum hydroxide, the preparation belongs to group B. The minimum aluminum hydroxide content is calculated as follows: a decrease in the magnesium hydroxide content by 1 mg requires an increase in the aluminum hydroxide content by at least 0.25 mg. In our example: a decrease in the magnesium hydroxide content by 75 mg (from 250 mg to 175 mg) requires a minimum increase in the aluminum hydroxide content by 18.75 mg (if rounded by 19 mg). Therefore, the content of aluminum hydroxide in the preparation should be at least 219 mg.
3. If the preparation contains 85 mg of magnesium hydroxide and a sufficient amount of aluminum hydroxide, the preparation belongs to group C. The minimum aluminum hydroxide content of aluminum is calculated as follows: a decrease in the magnesium hydroxide content by 1 mg requires an increase in the aluminum hydroxide content by at least 0.25 mg. In our example: reducing the magnesium hydroxide content by 40 mg (from 125 mg to 85 mg) requires a minimum increase in the aluminum hydroxide content by 10 mg.Therefore, the content of aluminum hydroxide in the preparation should be at least 110 mg.
** If the preparation contains aluminum oxide, recalculate its content on aluminum hydroxide: 1 mg of oxide corresponds to 1.53 mg of aluminum hydroxide.
Preparation of solution with preparations of group A.
Add 100 ml of water to the label of 100 ml on the label of the vial, a solution with a concentration of didanosine of 20 mg / ml is formed. Mix well. Add the antacid suspension to the label of 200 ml on the vial label. The concentration of didanosine in the suspension is 10 mg / ml. Mix well.
Preparation of solution with preparations of group B.
Add 100 ml of the antacid suspension to the 100 ml label on the vial label, a suspension with a didanosine concentration of 20 mg / ml is formed. Mix well. Add the antacid suspension to the label of 200 ml on the vial label. The concentration of didanosine in the suspension is 10 mg / ml. Mix well.
Preparation of solution with preparations of group C.
Add 100 ml of the antacid suspension to the 100 ml label on the vial label. Mix well. Add the antacid suspension to the label of 200 ml on the vial label. Mix well. Transfer the resulting suspension to a glass or plastic bottle of a suitable size and add to it another 200 ml of the antacid suspension.The concentration of Didanosine in the resulting suspension is 5 mg / ml, the resulting suspension is enough for half a day less than with the use of Group A and B antacids.
The prepared mixture should be stored in a tightly closed bottle in the refrigerator (2 to 8 ° C) for no more than 30 days. Shake before use. The unused medication after 30 days of storage is discarded.
Use in special patient groups
Adults with impaired renal function: it is recommended to reduce the dose and / or increase the intervals between doses due to the slowing down of didanosine excretion rate:
Creatinine clearance (ml / min / 1.73 m2) | Dosing regimen |
Body mass ≥ 60 kg |
≥ 60 (usual dose) | 400 mg 1 once a day |
| or 200 mg twice daily |
|
30-59 | 200 mg once a day or 100 mg 2 times a day |
|
10-29 | 150 mg once a day |
|
< 10 | 100 mg once a day |
|
Body weight <60 kg |
|
> 60 (usual dose) | 250 mg once a day or 125 mg twice daily |
|
30-59 | 150 mg once a day or 75 mg twice daily |
|
10-29 | 100 mg once a day |
|
< 10 | 75 mg once a day |
|
Patients on peritoneal dialysis or hemodialysis should take a daily dose of the drug after dialysis, following recommendations for patients with creatinine clearance <10 mL / min. There is no need for an additional dose of the drug after a hemodialysis session.
Children with impaired renal function. Didanosine is excreted mainly in the urine, so its clearance may vary in children with impaired renal function. Precise recommendations for correcting the dose of the drug in children are absent. Correction of the dosing regimen (dose reduction and / or increase in the interval between doses of the drug) should be performed depending on the creatinine clearance using a principle similar to that recommended for adult patients with impaired renal function.
For elderly patients the usual dosing regimen for adult patients is recommended. However, in view of a possible reduction in kidney function, it is necessary to monitor their performance and, accordingly, adjust the dose of the drug according to the recommendations for adult patients with impaired renal function.
For patients with impaired liver function no dose reduction is required. During treatment with the drug, it is necessary to examine the level of liver enzymes. With a clinically significant excess of the activity of liver enzymes, it is necessary to suspend treatment with the drug. With the rapidly increasing activity of aminotransferases, it may be necessary to stop or stop treatment with nucleoside analogues.
Dosing regimen with simultaneous use with tenofovir
For patients who take both Videx® and tenofovir, a reduction in the daily dose of Videx® is required:
for adults with a body weight of at least 60 kg and a creatinine clearance of at least 60 ml / min - 250 mg once a day on an empty stomach together with tenofovir (alternatively, if tenofovir taken with food, then Videx® powder on an empty stomach - 30 minutes before or 2 hours after eating);
for adults weighing less than 60 kg and creatinine clearance of at least 60 ml / min - 200 mg once a day on an empty stomach along with tenofovir (alternatively, if tenofovir taken with food, then Videx® powder on an empty stomach - 30 minutes before or 2 hours after eating).