As most would say, you should have a SERM on hand just incase a problem arises.
Yes though, an OTC PCT should do just fine. H-Drol is mild compared to other PH's and alot of people who have cycled it have had little to almost no side effects and although it varies from person to person most seem to go with the OTC PCT. Just be aware that results and sides differ from person to person so it really just depends on how your body handles it.
My PCT Recommendation:
If you are running the basic 5 week cycle of 50/75/75/75/75 or 6 week cycle of 50/50/75/75/75/75 then I would suggest this as your PCT.
Inhibit-E: dosed at 3/2/2/1
CEL PCT Assist: Bottle Dosages
Supress C: Start on the 3rd week and go with Bottle Recommended Dosages
I havn't actually cycled H-Drol yet but I am begging Monday and this is how I am running my PCT. I've done a load of research and asked many questions on here and few other websites and most agree that this will be fine in running after H-Drol.
Hope that helps