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Fensolvi Dosage

Generic name: LEUPROLIDE ACETATE 45mg in 0.375mL;
Dosage form: injectable suspension, for subcutaneous use
Drug classes: Gonadotropin releasing hormones, Hormones / antineoplastics

Medically reviewed by Last updated on Apr 18, 2024.

Dosing Information

FENSOLVI must be administered by a healthcare professional.

The dose of FENSOLVI is 45 mg administered by subcutaneous injection once every six months.

Discontinue FENSOLVI treatment at the appropriate age of onset of puberty.


Monitor response to FENSOLVI with a GnRH agonist stimulation test, basal serum luteinizing hormone (LH) levels or serum concentration of sex steroid levels at 1 to 2 months following initiation of therapy and as needed to confirm adequate suppression of pituitary gonadotropins, sex steroids, and progression of secondary sexual characteristics. Measure height (for calculation of growth velocity) every 3 to 6 months and monitor bone age periodically.

Noncompliance with drug regimen or inadequate dosing may lead to gonadotropins and/or sex steroids increasing above prepubertal levels resulting in inadequate control of the pubertal process. If the dose of FENSOLVI is not adequate, switching to an alternative GnRH agonist for the treatment of CPP with the ability for dose adjustment may be necessary.

Reconstitution Instructions

Use aseptic technique including gloves for reconstitution and administration. Allow the product to reach room temperature before reconstitution to allow for easier administration. Once reconstituted, the concentration is 45 mg/0.375 mL. Administer the product within 30 minutes or discard.

FENSOLVI is packaged in a carton containing two trays and this package insert:

Table 1: Contents of the Two Trays in the FENSOLVI Carton

Syringe A Tray

Syringe B Tray

Syringe A is prefilled with diluent for reconstitution
(ATRIGEL Delivery System)

Syringe B is prefilled with 45 mg lyophilized
leuprolide acetate powder

White plunger rod (To be used with Syringe B)

Safety needle (18G x 5/8")

Desiccant pack

Desiccant pack

Follow the instructions below to prepare FENSOLVI:

figure 1figure 2 1. On a clean field, open both trays by tearing off the foil from the corners and removing the contents. Discard the desiccant pack(s). Open the safety needle package by peeling back the paper tab.
Figure 3

2. Pull out (do not unscrew) the short blue plunger rod with attached gray stopper from Syringe B and discard.

figure 4

3. Gently screw the white plunger rod into the remaining gray stopper in Syringe B.

figure 5

4. Unscrew and discard the clear cap from Syringe A.

figure 6

5. Remove and discard the gray rubber cap from Syringe B.

figure 7

6. Join the two syringes together by pushing and gently screwing until secure.

figure 8

7. Inject the liquid contents of Syringe A into the leuprolide acetate powder contained in Syringe B. Thoroughly mix the product for approximately 45 seconds by pushing the contents back and forth between both syringes to obtain a uniform suspension. When thoroughly mixed, the suspension will appear pale yellow. Note: Product must be mixed as described; shaking will not provide adequate mixing.

figure 9

8. After mixing, hold the syringes vertically (upright) with Syringe B (wide syringe) on the bottom. The syringes should remain securely coupled. Draw all of the mixed product into Syringe B by depressing the Syringe A plunger and slightly withdrawing the Syringe B plunger.

figure 10

9. Unscrew Syringe A to decouple the syringes while continuing to withdraw the Syringe B plunger. Note: Small air bubbles will remain in the formulation – this is acceptable.


10. Continue to hold Syringe B upright with the open end at the top. Hold back the white plunger on Syringe B to prevent loss of the product and attach the safety needle cartridge. Gently screw clockwise with approximately a three-quarter turn until the needle is secure. Do not overtighten, as the hub may become damaged resulting in leakage of the product during injection. The safety sheath may also be damaged if the needle is screwed with too much force.

figure 12

11. (1) Move the safety sheath away from the needle and towards the syringe and (2) pull off the clear needle cartridge cover immediately prior to administration.

Note: Should the needle hub appear to be damaged, or leak, do not use the product. If the needle hub is damaged or leakage is observed, use a new FENSOLVI carton.

Administration Instructions


1. Select a subcutaneous injection site on the abdomen, upper buttocks, or another location with adequate amounts of subcutaneous tissue that does not have excessive pigment, nodules, lesions, or hair. Avoid areas with brawny or fibrous subcutaneous tissue or locations that could be rubbed or compressed (i.e., by a belt or clothing waistband). Rotate injection sites with each injection.

2. Cleanse the injection-site area with an alcohol swab (not enclosed).

3. Using the thumb and forefinger, grab and bunch the area of skin around the injection site.


4. Using your dominant hand, insert the needle quickly at a 90° angle to the skin surface. The depth of penetration will depend on the amount and fullness of the subcutaneous tissue and the length of the needle. After the needle is inserted, release the skin.

5. Inject the drug using a slow, steady push and press down on the plunger until the syringe is empty.

6. Withdraw the needle quickly at the same 90° angle used for insertion.

figure 2-4-3

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7. Immediately following the withdrawal of the needle, activate the safety shield using a finger/thumb or flat surface and push until it completely covers the needle tip and locks into place.

figure 2-4-5figure 2-4-6

8. An audible and tactile “click” verifies a locked position.

9. Check to confirm the safety sheath is fully engaged. Discard all components safely in an appropriate biohazard container.

Frequently asked questions

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.