Opium Bar occupies the top two floors of the same heritage shophouse that houses Potong on Vanich 1 Road in Chinatown. The 4th floor is the main bar: dark wood, low ceilings, original architectural details from when the building was a Chinese herbal pharmacy. The cocktail program is built around house-distilled gins infused with Thai regional ingredients, served in handcrafted ceramic vessels. The 5th floor opens onto a rooftop garden with views over Yaowarat neon-lit streets. It is quiet enough to talk up there when the bar below is full.
The entrance is through the Potong building, and there is no separate street-level signage for the bar itself. You walk through the restaurant floors and climb to the 4th, where the space opens into a low-ceilinged room with the bar counter along one side and intimate seating throughout. The original wooden architecture is intact, and the lighting keeps things deliberately dim.
The cocktail menu is organized by intensity and built around four house-distilled gins. Each drink arrives in a different handmade vessel. The bar food is light and designed to pair. The team knows the menu deeply and can guide you through a flight if you ask.
The rooftop on the 5th floor is the standout space: a glass house and open garden terrace with a Chinese neon sign overhead and the Chinatown skyline beyond. It works for a nightcap after dinner at Potong or as a destination on its own.