The imprint “VGR 100” is a tablet identification code used on certain sildenafil 100 mg tablets. Tablet imprints are an important part of pharmaceutical manufacturing, helping healthcare professionals, pharmacists, and regulatory authorities identify medications and distinguish between different strengths and manufacturers. Unlike the active pharmaceutical ingredient itself, the imprint is not a brand name or a scientific invention but a manufacturing identifier.
Origins of Sildenafil
The history of tablets bearing the VGR 100 imprint begins with the discovery of sildenafil citrate in the late 1980s and early 1990s. Scientists at Pfizer were initially investigating compounds that could be used to treat cardiovascular conditions such as angina pectoris and hypertension.
During clinical studies, researchers observed that one experimental compound produced an unexpected physiological effect: improved erectile function in male participants. This finding redirected the research program toward the treatment of erectile dysfunction.
In 1998, sildenafil became the first oral phosphodiesterase type 5 (PDE5) inhibitor approved for the treatment of erectile dysfunction.
Development of Tablet Imprints
As sildenafil became widely manufactured, pharmaceutical companies adopted tablet imprint systems to comply with regulatory requirements and improve medication identification.
Tablet imprints generally include combinations of letters and numbers that indicate:
- The manufacturer
- The product line
- The dosage strength
- Internal manufacturing identification
The code VGR 100 is one such imprint used on certain 100 mg sildenafil tablets. The number 100 identifies the labeled strength of the tablet (100 mg), while the letters VGR form part of the manufacturer’s identification code.
Purpose of the VGR 100 Imprint
The imprint was developed to assist with medication identification rather than marketing. Its primary functions include:
- Helping pharmacists identify tablets
- Reducing medication dispensing errors
- Assisting poison control centers in identifying unknown medications
- Supporting pharmaceutical quality control
- Facilitating regulatory inspection and product verification
Tablet imprints are an established feature of modern pharmaceutical manufacturing and are widely used for prescription and over-the-counter medicines.
Manufacturing Standards
Tablets carrying the VGR 100 imprint are manufactured using standard pharmaceutical production techniques. During manufacturing, the imprint is pressed into the tablet using precision steel dies during the compression process.
Each production batch undergoes quality-control testing to verify:
- Correct tablet weight
- Uniform dosage
- Proper hardness
- Dissolution characteristics
- Accurate imprint appearance
These procedures help ensure product consistency and compliance with pharmaceutical manufacturing standards.
Importance in Medicine Identification
Healthcare professionals rely on tablet imprints as one component of medication identification. However, an imprint alone cannot verify that a product is authentic, since counterfeit medicines may imitate legitimate markings.
Proper identification also considers:
- Tablet color
- Shape
- Size
- Packaging
- Manufacturer information
- Batch or lot number
