Drug Interactions With Timolol
It is dangerous to combine methacholine with timolol. Doing so could cause severe, asthma-like breathing problems that are not easily corrected. These medications should never be taken together.
Other Beta Blockers
Timolol is a beta blocker. Caution should be used if it is taken with other beta blockers. Such combinations may increase the risk of side effects.
Combining reserpine with a beta blocker like timolol can increase the risk of serious side effects. You may need to be monitored closely if you take these medications together. In some cases, timolol and reserpine should not be combined.