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1H spin-lattice Nuclear Magnetic Resonance (NMR) relaxometry, vibrational spectroscopy and Atomic Force Microscopy (AFM) have been applied to differentiate between original and counterfeit Viagra®. The relaxation studies have been performed in a frequency range covering four orders of magnitude, from 4kHz to 40MHz. It has been shown that for the counterfeit product the relaxation is bi-exponential...