Is the company supplying this Amlodipine 5mg + Chlorthalidone 12.5mg + Telmisartan 80mg Tablet reliable?

I can't really vouch for a specific manufacturer's reputation, but that's a completely valid thing to check. The product page shows the manufacturer's details, and our customer support team can give you clearer information on sourcing and authenticity. It is also a good habit to check that the pack is sealed and the batch number and expiry date are clearly printed.