I heard Desmo Testex Prolongatum stopped adding preservative at a certain batch numbers. Does anyone know at which batch numbers they stopt adding preservatives. I ask this because I take the 250mg/2ml solution from several ampules and put the contents in to a 10ml vial and get through the vial in a few months but can’t do that if there is no longer preservative in the Testex. I have some unopened ampules from some time ago and some I got this week all with different batch numbers but I don’t know which batch numbers if any have the preservative in. I got them in Spain.
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All you would need to do is look over the package insert/leaflet which will list the composition of the formula (esterified T (prodrug), carrier oil (vehiculum) and excipient.
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esterified T (prodrug) whether (undecanoate/cypionate/enanthate/propionate/ or mixed esters)
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carrier oil (vehiculum) such as (sesame, cottonseed, castor, peanut, grapeseed)
- excipient such as:
Benzyl alcohol • Solubility enhancer • Oil viscosity reducer • Local anesthetic • Preservative
Benzyl benzoate • Solubility enhancer • Solvent
Ethanol • Solvent
Chlorobutanol • Preservative
Preservatives like BA or chlorobutanol prevent microbial growth in multi-dose vials.
Your testosterone 17β-cyclopentylpropionate or TC comes in single-use glass ampoules (2 ml each), which are sterile-sealed and intended for immediate one-time injection.
They do not need a preservative.
From my understanding they have never used one.
If you look through the public databases and check the inserts/leaflets from 2020-2025 they do not list any preservative.
Most recent package insert/leaflet.
Composition of Testex Prolongatum
The active ingredient is
testosterone cyclopentylpropionate. One ampoule contains 250 mg of testosterone cyclopentylpropionate (corresponding to 174.8 mg of testosterone) in 2 ml of solution.
The other components (excipients) are: ethyl oleate and olive oil.”
28046 Madrid, Spain
Manufacturing responsible:
B. Braun Medical, S.A.
Ronda de Los Olivares, parcel 11,
Los Olivares Industrial Park,
Jaén 23009.
Spain
Date of the last revision of this prospectus: April 2025
Detailed and updated information on this medicine is available on the website of the Spanish Agency for Medicines and Health Products (AEMPS).
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