There are generic medications whose therapeutic effect is not equal to that of the brand-name original medication: Some of the generic antibiotics have less antibacterial potency or solubility than the brand name products[5]. Meropenem[5, 18] Teicoplanin[4] Levothyroxine[10] Clozapine[15] Citalopram[23] Antiepileptic drugs: carbamazepine, levetiracetam [19, 20]. Several studies showed a recurrence of convulsions after the shift to generic antiepileptic drugs. Alendronate: several differences between generic alendronate and brand-name Fosamax® have been reported, including disintegration time, patient persistence to therapy, side effects and tolerability, clinical efficacy[21]. Equivalence is particularly difficult to obtain for extended-release or delayed-release formulations, e.g. verapamil[24], bupropion[25], methylphenidate[26].