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Table 1 Microbiological contamination in counterfeit and unapproved drugs in the Austrian study

From: Microbiological contamination in counterfeit and unapproved drugs

Product Microbial load
TAMC (CFU/g) TYMC (CFU/g) Pathogens
Approved PDE5 inhibitors
Sildenafil 50 mg < 5 < 5 nd
Tadalafil 10 mg < 5 < 5 nd
Vardenafil 10 mg < 5 < 5 nd
Counterfeit PDE5 inhibitors
Sildenafil 100 mg #1 < 5 < 5 nd
Sildenafil 100 mg #2 < 5 10 negative
Sildenafil 100 mg #3 < 5 < 5 nd
Sildenafil 100 mg #4 < 5 < 5 nd
Sildenafil 100 mg #5 < 5 < 5 nd
Sildenafil 100 mg #6 170 < 5 negative
Tadalafil 80 mg #7 < 5 < 5 nd
Other unapproved products
Zinc gluconate #8 < 5 < 5 nd
Nicotic acid #9 < 5 < 5 nd
Methandienone #10 80 < 5 negative
Methandienone #11 11 000 < 5 negative
Mephedrone HCl #12 n/a n/a n/a
Butylone HCl #13 n/a n/a n/a
Methandienone #14 80 60 negative
Stanozolol #15 100 < 5 negative
Stanozolol #16 110 < 5 negative
Clenbuterole 0.02 mg #17 < 5 < 5 nd
Sibutramine, phenolphtalein #18 20 40 negative
Sildenafil 100 mg #19 < 5 < 5 nd
4-Methylethcathinone #20 < 5 < 5 nd
4-Methylcathinone/Coffein #21 < 5 < 5 n/a
4-Methylcathinone/Coffein #22 < 5 < 5 n/a
4-Methylcathinone/Coffein #23 < 5 < 5 nd
3-Fluoromethcathinone/Lidocaine/Coffein #24 < 5 < 5 nd
Coffein/Acetylsalicylic acid #25 < 5 < 5 nd
Slimming herb #26 (herbal product) 720 000 4 000 >104 bile-tolerant gram-negative bacteria
  1. TAMC: Total aerobic microbial count; TYMC: Total yeast and mould count; nd: Not determined; n/a: Not applicable (interfering substance prevented successful completion of the test).
  2. Illegal medicines confiscated in Austria were analysed for microbiological contaminations by microbial enumeration tests and tests for specific pathogens.