Indian drugmaker Aurobindo Pharma Ltd received approval to sell oral solutions of citalopram, a generic version of Forest Laboratories Inc's antidepressant Celexa, in the US. Also, Sun Pharmaceuticals Industries Ltd received approval from the US Food and Drug Administration (FDA) to sell gabapentin, a medicine used to alleviate nerve pain and epileptic seizures, the regulator said on its web site. The Mumbai-based Sun Pharmaceuticals won approval to sell tablets and capsules of its own version of Pfizer Inc's painkiller Neurontin. The FDA gave its approval on Tuesday, according to its web site. Aurobindo Pharma had earlier received approval to sell tablets of citalopram in the US, the world's biggest drug market.