Yes, here's what's written on the entire cleaner's label:

Directions for Use

Apply the cleaner directly to the inside surface of the toilet bowl.

Distribute it evenly using a toilet brush to cover all areas, especially under the rim.

Leave it for 10-15 minutes to allow the cleaner to dissolve stains and kill germs.

Clean the toilet thoroughly with the brush, then flush with water.

Danger

Contains hydrochloric acid. Causes severe skin burns and eye damage. Do not inhale fumes. Keep out of reach of children. Do not reuse empty bottles.

First Aid

If on skin: Wash with plenty of soap and water. If skin irritation occurs, seek medical advice or attention.

If in eyes: Rinse cautiously with water for at least 15 minutes and seek medical advice.

vomiting. Immediately call a poison control center or doctor.

If inhaled: Move the victim to a place with fresh air and keep them comfortable to breathe.