One should be particularly cautious about combining salvia with other drugs. As is the case with most drugs, some combinations may interact in unexpected and possibly negative ways.
Many people who are taking regular medications do use salvia with no adverse effects. Although salvia appears to be relatively safe when combined with many medications, there probably are some drugs that it should not be combined with. It is important to remember that each individual is unique. The fact that some people do not experience problems with a particular combination does not guarantee that that combination is safe for everyone.
If you must combine salvia with another drug, you should always do so cautiously. Start with an extremely conservative dose so as to reduce the risk, should a negative reaction occur. If no negative reaction occurs, you can try increasing the dosage slightly on subsequent attempts. Provided that no adverse effects are experienced, you can increase the dose until you obtain the desired level of effects. One should always have an alert, responsible sitter present when experimenting with new combinations. It is important to have someone on hand who can help you, should the need arise.
We are aware of one individual who reported that his breathing became somewhat constricted and labored for several minutes when he smoked salvia following a high dose of GABA. While it is not certain that this reaction was due to an interaction of the two drugs, it would be prudent to avoid this combination.