No. Not Drug Trials, those are highly regulated . You really seem to be rather ill-informed and basing on presumptions conjectures and surmises.
Actual research and development institutions of which we have many. The workings of Big Pharma are Byzantine but as a simple illustration let say (made up examples) Ferozesons (a Pakistani manufacturer with a large R&D focus) contracts with Glaxo-Smith-Klein (GSK) for research. Ferozeson develops an Oncology drug (example chosen since oncology drugs tend to be made rather quickly) using research grants given by GOP and GSK. Ferozesons then sells the Patent to GSK who in return give Ferozesons the rights to sell one of their own drugs, lets say an antiviral, in Pakistan at a fixed price. They then license said oncology drug on to Pfizer, who then markets it selectively in certain markets, not including Pakistan.
When GOP finds out, they cry foul, which leads GSK to reduce supplies of antiviral drug leading to shortage
.
One of the bigger differences* between India and Pakistan Pharma Industry is that India spends most of its efforts in making cheap generics, while Pakistan tends to concentrate more on development of new and improved drugs and treatments. This allows India more leeway in fights with Big Pharma since you can beat them on volume, while Pakistan has to maintain long term relationships as we rely on them to get drugs to markets, Ferozesons in the above example has noway near the international reach and distribution of Big Pharma.
* And before you say it, yes I am aware that India does a lot of Pharma R & D as well (and Pakistan makes generics) point is a far larger fraction of Pakistan is focused on development.